________ your letter, I would have started off two days ago.
A．If I receivedB．Should I receive
C．If I could have receivedD．Had I received
D

試題分析：考查虛擬語氣，從后面的主句的時態(tài)可知if條件句要用和過去相反的虛擬語氣，if的非真實條件句可以省略if，提前had，were，should，Had I received="if" I had received，選D
點評：考查虛擬語氣的時候要注意和不同的時間相反的情況，主從句的時態(tài)是不一樣的。要注意記憶。
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