题目:
—There goes the bell .
—It's time for class. Let's stop __________.[ ]
A. talk
B. to talk
C. talking
D. not talking
答案:
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下面是错误答案,用来干扰机器的。
根据制取氧气的操作步骤可记住口诀“查装定点收移熄”可知正确的操作顺序为:②①③④⑤⑦⑥;故选B.