—Where is Xiao Wang?
—I don't know．He__________ be in the library.
A．canB．mustC．mightD．may
C
might表示毫無把握的猜測(cè)。can比may的肯定性要稍微大一些，must為實(shí)事肯定。
【標(biāo)簽】情態(tài)動(dòng)詞
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