Where could my son ______the key? I couldn’t find anywhere.A、putB、have putC、ha

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问题 Where could my son ______the key? I couldn’t find anywhere.

选项 A、put
B、have put
C、has put
D、had put

答案 B

解析由本句句意可以推断出该句为完成时态，又因为could后须跟动词原形，故选项B“have put”符合题意。

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