Tom has been in the factory _________he left school.

Tom has been in the factory _________he left school.
A.when B.since C.as soon as D.whether 说明.
huangqiancz 1年前 已收到1个回答 举报

零玲铃 幼苗

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选B.由主句谓语has been可知,状语从句引导词必须用since引导.

1年前

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