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

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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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