The mother was nervous because she had not     her son who was away at a boarding school.
A．heard from B．heard of C．heard about D．heard out
A
短語辨析。A收到sb的來信；B=C聽說；D聽完；根據(jù)句意可知A正確。句意：那位母親很緊張，因?yàn)樗芫脹]有收到在住宿學(xué)生學(xué)習(xí)的兒子的來信。
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