题目:
The number of people invited ______ fifty, but a number of them ____ absent for different reasons.
A.were; was
B.was; was
C.was;were
D.were; were
答案:
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答案:C题目分析:A、H2O分子中H原子最外层为2电子结构,错误;B、BF3分子B原子最外层为6电子结构,错误;C、CCl4分子中C和Cl原子最外层均达到8电子稳定结构,正确;D、PCl5分子中一个P原子与5个Cl原子共用5对共...