tom has been in the factory --- he left school.a.since b.as soon as

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tom has been in the factory --- he left school.a.since b.as soon as
tom has been in the factory --- he left school.a.since b.as soon as

tom has been in the factory --- he left school.a.since b.as soon as
a
since 自从……以来
题意:汤姆自学校毕业以来就一直在这家工厂工作.

since

A.因为since一般用现在完成时(has been),as soon as是并列的

选a. since 加含过去时间的从句,主句一般用现在完成时或现在完成进行时。现在完成进行时强调懂做从过去开始延续到现在,也许还会延续下去
如:We have been reviewing grammar since last week.

a
since表示从过去的一个时间点一直到现在的时间,这正好是has been这种现在完成时所要求的时间。从句中用一般过去时,而主句用现在完成时。as soon as是表示两个动作连着发生的,都有一般过去时,根据主句是现在完成时,从句是一般过去时,故排除b。...

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a
since表示从过去的一个时间点一直到现在的时间,这正好是has been这种现在完成时所要求的时间。从句中用一般过去时,而主句用现在完成时。as soon as是表示两个动作连着发生的,都有一般过去时,根据主句是现在完成时,从句是一般过去时,故排除b。

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