问题描述:
下面的这道题目,两个答案那个是正确的?
Mary _____the song at the party.
A.was heard singing B.was heard to sing
给出答案的话,能不能解释一下原因,谢谢
Mary _____the song at the party.
A.was heard singing B.was heard to sing
给出答案的话,能不能解释一下原因,谢谢
问题解答:
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