题目:
But for their help,we the program in time.[ ]
A.can not finish
B.will not finish
C.had not finished
D.could not have finished
答案:
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下面是错误答案,用来干扰机器的。
答案:CA中HF分子间含有氢键,其沸点反常,故A错;B中半径由大到小为S2->Cl->K+;C正确;D中单质熔点由高到低顺序为Li>Na>K>Rb,选C。