问题

If we________ , we can realize the progress we have made in space research.

A:turn back
B:look back
C:answer back
D:move back

正确答案是：

同类题型

Chinese new traffic rules in 2013 give more severepunishment to offenders compared with ______ carried out in previous years

Hi, Lydia. Are you going to the concert on Friday?— I’d like to. But there are so many problems_______.[ ]

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．—Hewas born in Shanghai but studied in Nanjing . —_________.