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I have been looking for Michael for a whole day. Where ______ he have gone?
A．shouldB．canC．mustD．may
B
考查情態(tài)動詞表推測的用法。can 表推測常用語疑問或否定句中，can have done 表示對過去的推測，句意：我一整天一直在找米莎爾，他可能會去哪呢？所以選B。
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