单项选择题

It was unbelievable that the fans waited outside the gym for three hours just _______ a look at the sports stars.
A.had B.having C.to have D.have

A.A.

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单项选择题

You should understand the traffic rule by now. Youve had it_______ often enough.A.explaining B.to explain C.explain D.explained

单项选择题

下列叙述正确的是A ．同温同压下，相同体积的物质，它们的物质的量必相等B ．任何条件下，等物质的量的乙烯和一氧化碳所含的分子数必相等C ．1L 一氧化碳气体一定比1L 氧气的质量小D ．等体积、等物质的量浓度的强酸中所含的H+ 数一定相等

A.同温同压下，相同体积的物质，它们的物质的量必相等B.任何条件下，等物质的量的乙烯和一氧化碳所含的分子数必相等C.1L
D.等体积、等物质的量浓度的强酸中所含的H⁺

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