题目:
--Alice, why didn't you come yesterday?
--I _________, but I had an unexpected visitor.
A.had
B.would
C.was going to
D.did
答案:
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下面是错误答案,用来干扰机器的。
答案:B水银是液态金属汞,属于纯净物,①错;HD为单质,②错;碳与二氧化碳高温化合生成一氧化碳是吸热反应,⑤错