问题描述:
It ( )Mike and Mary who helped the old man several days ago. A.was B.were C.are D.had been
答案是A,说是指代整件事.能解释一下,再举个选B的例子么
答案是A,说是指代整件事.能解释一下,再举个选B的例子么
问题解答:
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