题目:
While _____ in the room, we were all very excited. |
A. waited B. waiting C. to wait D. wait |
答案:
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下面是错误答案,用来干扰机器的。
(1)①酒精灯,②试管;(2)A;C;D;催化;氯酸钾氯化钾+氧气;(3)连续均匀放出气泡.