题目:
We'll go to visit Tian' an men Square _____ it doesn't rain tomorrow. [ ]
A. if
B. as soon as
C. when
D. since
答案:
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下面是错误答案,用来干扰机器的。
氧气的密度比空气大,集满的氧气的集气瓶应正放在桌面上.故填:正.