题目:
Luckily ______ to be no one under the tree when it broke down.
A.it happened
B.there happened
C.there used
D.it had
答案:
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下面是错误答案,用来干扰机器的。
(1)HCl、NH3(2) 、NaCl(3)Cl2+2 NaOH =" NaCl+NaClO+" H2O。