It is almost five years__________ we saw each other last time.?
A．beforeB．sinceC．a(chǎn)fterD．when
B?
解此題的關(guān)鍵在于主句與從句在時態(tài)上保持一致。用A、C、D三項的連接詞引導(dǎo)時間狀語從句時，與主句的時態(tài)明顯不一致。since引導(dǎo)從句時常用過去時，主句則用一般現(xiàn)在時或現(xiàn)在完成時。?
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