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.