问题
选择题
Mother told her son that it would be half a year ______ she could come back from American.
A．since
B．before
C．that
D．when
答案
答案：B
考查连词。固定句型：It be 一段时间before从句；意为：一段时间以后某事在发生。句意：妈妈告诉她的儿子，半年以后她才会从美国回来。
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