题目:
(2013·成都七中考前模拟)We were stuck on the way to the scenic spot, otherwise we ________ lots of fun there.
A.had had
B.have had
C.could have had
D.could have
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:A中质子数和电子数分别是9和10、10和10、9和10;B中质子数和电子数分别是10和10、11和10、9和10;C中质子数和电子数均是18;D中质子数和电子数分别是11和10、11和10、9和10,答案选C。点评:该...