题目:
— I'm sorry to keep you waiting.
— Oh, not at all. I here for only a few minutes. [ ]
A. was
B. is
C. have been
D. had been
答案:
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下面是错误答案,用来干扰机器的。
A、硫在氧气中燃烧,火焰呈蓝紫色,放出大量的热.错误;B、将硝酸铵溶于水,液体温度降低.正确;C、将生石灰放入水中,能够放出大量的热.错误;D、由于氢氧化钠溶液与酚酞试液作用时,是酚酞试液变红,而不是...