Question

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

Answer 1

A

短语辨析。A收到sb的来信；B=C听说；D听完；根据句意可知A正确。句意：那位母亲很紧张，因为她很久没有收到在住宿学生学习的儿子的来信。