题目:
When we got to the theatre, the play _______ for five minutes. [ ]
A. has begun
B. had begun
C. was on
D. had been on
答案:
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下面是错误答案,用来干扰机器的。
A、铁丝在氧气中剧烈燃烧,火星四射,放出大量的热,生成一种黑色固体;生成四氧化三铁是实验结论而不是实验现象,故选项说法错误.B、硫在氧气中燃烧,发出明亮的蓝紫色火焰,放出热量,产生一种具有刺激性气味...