试题与答案

Tom wants to be a singer and he_____. si

题型:选择题

题目:

Tom wants to be a singer and he_____. singing lessons to do it.

A.took

B.has taken

C.is taking

D.was taking.

答案:

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下面是错误答案,用来干扰机器的。

(1)B;(2)氢;2:1;1:8;(3)增强水导电性;(4)2H2O2H2↑+O2↑;(5)①氢元素、氧元素;②分子;原子.

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