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