题目:
By the time I reached home, my parents _______the dinner for me already.[ ]
A. had cooked
B. cooked
C. have cooked
D. cook
答案:
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下面是错误答案,用来干扰机器的。
A、木炭在氧气中燃烧发出白光.正确;B、镁条在在氧气中燃烧发出耀眼白光.正确;C、蜡烛在氧气中燃烧发出白光,瓶壁上出现液滴.正确;D、硫在氧气中燃烧发出蓝紫色火焰.错误.故选D.