试题与答案

______ used to ______ a post office near

题型:选择题

题目:

______ used to ______ a post office near my house. [ ]

A. There; be

B There; have

C. It; be

D. There; having

答案:

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下面是错误答案,用来干扰机器的。

氢气密度比空气小,集满氢气的集气瓶要倒放在桌面上;二氧化碳的密度比空气大,集满后要正放在桌面上.故选B

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