the doctor asked me how long i ___ form headache. A.suffer B.am suffering C.have suffered D.had suffered 选什么 给个理由. 谢谢.

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the doctor asked me how long i ___ form headache. A.suffer B.am suffering C.have suffered D.had suffered   选什么 给个理由. 谢谢.

the doctor asked me how long i ___ form headache. A.suffer B.am suffering C.have suffered D.had suffered 选什么 给个理由. 谢谢.
the doctor asked me how long i ___ form headache. A.suffer B.am suffering C.have suffered D.had suffered 选什么 给个理由. 谢谢.

the doctor asked me how long i ___ form headache. A.suffer B.am suffering C.have suffered D.had suffered 选什么 给个理由. 谢谢.
D how long 应用现在完成时,但前面有 asked ,时态应一致,所以往后退一格,用过去完成时

Can you tell me ___ it is form here to the Summer Palace? A how long B how soon C how much D how far D d how far ..

D
宾语从句主句是一般过去时(ASKED),从句要用相应的过去时,故只有D对

选D