--Where is Xiao Wang?
--I don’t know. He__________ be in the library.
A．canB．mustC．mightD．may
C
考查情態(tài)動詞。“小王在哪里？”“我不知道。他可能在圖書館�！备鶕�(jù)答語可知，這里表示的是不肯定的語氣。might的可能性比may小。故選C。
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