Where could she ______ the key? I couldn’t find anywhere.

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问题 Where could she ______ 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 根据后半句“couldn’t fmd”可判断,放钥匙的动作发生在“find”之前。“could have done sth.”表示“有可能 (会) 做某事”,是对过去发生的行为的一种推测。
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