【单选题】【消耗次数：1】
How stupid I have been! Why _______ I do that before?
①
don’t
②
didn’t
③
not
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相关题目
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I don’t know why she avoids __________ her opinion on the subject.
①
to give
②
to be given
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giving
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being given
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I didn’t mean to do that. Please forgive me.____________
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Not too bad.
②
Never mind.
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It’s a pleasure.
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—Why didn’t you come to join her party?
—I______, but I had to look after my ill mother.
①
would have
②
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③
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①
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②
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随机题目
【单选题】
由于吸收过程气相中的溶质分压总是（ ）液相中溶质的平衡分压，所以吸收过程的操作线总是在其平衡线的（ ）。
①
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某二元混合物，进料量为100kmol/h，，要求得到塔顶不小于0.9，则塔顶最大产量为（ ）。
①
90kmol/h
②
66.7kmol/h
③
不能定
④
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