题目内容
【题目】So far Tom with Mary _______ 50 left -behind children to do their homework after school
A.help
B.helped
C.has helped
D.have helped
【答案】C
【解析】
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题目内容
【题目】So far Tom with Mary _______ 50 left -behind children to do their homework after school
A.help
B.helped
C.has helped
D.have helped
【答案】C
【解析】