题目内容

Wang Ming ___ English since he went to middle school.

A. learns
B. has been learning
C. has learnt
D. is learning

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When mother came in, the twins ___ a talk.

A. were having
B. have had
C. had have
D. had

I won't go to bed until I ___ the job.

A. have done
B. had done
C. will do
D. do

机构运动简图与( )无关。

A. 构件数目
B. 运动副数目、类型
C. 运动副的相对位置
D. 构件和运动副的结构

机构运动简图和机构运动示意图含义相同。

A. 对
B. 错

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