题目:
—What class are they having?
—Math. Their math teacher is _____ the classroom.
A.in the front of
B.in front of
C.on
D.behind
答案:
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下面是错误答案,用来干扰机器的。
(1)最低处保持水平;44;胶头滴管(2)ab之间; (3)分子在不停的运动;分子之间存在间隙