单选题
His parents are worried because they haven't heard of their son in more than two months.
A、
worried
B、
because
C、
of
D、
in
【正确答案】
C
【答案解析】
[解析] 应改为from。hear from意为“收到……的来信”。本句的意思是：“他的父母很担心，因为他们已2个多月没收到他们儿子的来信了。”
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