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