--- Listen! David is talking happily with his mother in the next room.
　--- It ______ be his mother. She has gone to Yunnan to be a volunteer doctor.
A．shouldB．mustC．can’tD．mustn’t
C
考查情景交際和情態(tài)動詞。“聽！大衛(wèi)在隔壁正在高興地和媽媽談話。”“她不可能是他的媽媽，她媽媽作為一名志愿醫(yī)生，已經(jīng)去云南了�！鼻閼B(tài)動詞可表推測。Should“應(yīng)該”；must“一定”；can’t“不可能”；musn’t“”禁止不，表推測。故選C。
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