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sincefive
这句话中since 的意思不是“自从”,而是 "既然"的意思,所以这句话的翻译为：既然有五个经理要做报告,那么这个会议讲会持续至少两个小时.
As many as five courses are provided and you are free to choose_______ suits you best. A．wh..
| B |
试题分析：考查宾语从句的连接词。本题中的whichever suits you best是一个宾语从句，whichever在句中做主语。CD两项在句中只能做状语。Which是指特定范围之内的某一个，是有范围限制的。句意：提供了多达五门学科，你可以自由选择任何一个最适合你的。说明是有范围限制的，故B正确。 点评：名词性从句的考查集中在引导词的选择上，连接词that, whether, if在句中不充当任何成分，只起连接作用；连接代词who(ever), which(ever), whom(ever),whose(ever),what(ever)在句中做主语，宾语，表语和定语；连接副词when, why, where, how，在句中做状语。应从上下句的句法关系着手分析，切不可‘望句形生答案’总的来说，考生在解答此类型时，可用排除法或造句法，造句法就是仿造原句的语法功能仿造出一个易懂易理解的句子，帮助判断。 |
since用法
since可以引导时间状语从句和原因状语从句。不能引导定语从句。
引导时间状语从句一般放在后面。指从说话前某一时刻到说话时刻这一段时间。常用于完成时态。He
has
been
living
in
Beijing
since
he
was
five.五岁后一直住在北京。
I
have
learned
English
since
you
left.你走了以后我就学了英语。
引导原因状语从句，主要是说明已知的必然性理由。只能放在前面引导，不能出现在后面。在后面常用as。
Since
you
are
ill,
you
had
better
not
go
to
school.既然病了，就别去学校了。另外记住，because常用来引导未知性必然理由。
关于since的用法总结
since的用法：译作“自从…以来”
(1)接时间点：如 I have stayed in that country since 1995. 要求：谓v.用现在完成时，而且须是延续性动词。
(2)接一段时间 + ago：如 They have lived in that house since two years ago. 要求：谓v.用现在完成时，而且须是延续性动词。
(3)接时间状语从句：如 I have loved her since I met her last time. / Lily has stayed at home since she left school. 要求：主句的谓v.用现在完成时，而且须是延续性动词；从句的谓v.用一般过去时，而且须是终止性动词。
(4)用于句型“It’s / It has been + 一段时间 + since + 时间状语从句”中，译作“自从…以来, 已经…(时间)了”。如 It’s / has been three months since he moved to this city. 要求：主句的谓v.用一般现在时或现在完成时；从句的谓v.用一般过去时，而且须是终止性动词。
(5)用于句型“一段时间 + has passed since + 时间状语从句”中，译作“自从…以来, …
(时间)已经过去了”。如上个例句还可写成：Three months has passed since he moved to this city. 要求：主句的谓v.用现在完成时，而且动词必须是has passed；从句的谓v.用一般过去时，而且须是终止性动词。
(6)注：当since用于否定句时，主句的谓v.可以是终止性动词。如 He hasn’t seen the film since last month.
(7)相关词组：“从那时起”：ever since、since then、from then on.
注：ever since作为一个词组，放句尾可单独使用。如I have given up smoking ever since. 另外，还可在since后接句子。since前加ever，只是加重语气而已。如 I have given up smoking ever since I caught a bad cough.
(8) since还可引导原因状语从句，译作“由于；因为”，相当于because。如 Since he was lazy, he didn’t finish his homework.
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