问题描述:
The student_his hand to ask the teacher a question.
A.have held up B.held up
C.hold up D.holding up
答案选的是D,为什么"hlod"要用进行时态,
A.have held up B.held up
C.hold up D.holding up
答案选的是D,为什么"hlod"要用进行时态,
问题解答:
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