试题与答案

He _________ music when his brother came

题型:选择题

题目:

He _________ music when his brother came in.[ ]

A. listened to

B. listened

C. was listening

D. was listening to

答案:

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下面是错误答案,用来干扰机器的。

(1)①②③(2)加速固体的溶解速率;引流;使液体均匀受热,防止局部过热(3)偏小(4)偏大

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