题目内容
It has been two years _________ he came to China.
A.since | B.after | C.before | D.till |
A
本题考查的是since引导的时间状语从句,since引导的从句为一般过去时,其主句为现在完成时,故选答案为A
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题目内容
A.since | B.after | C.before | D.till |