单项选择题

I felt somewhat disappointed and was about to leave（）something occurred which attracted my attention.

A. unless
B. until
C. when
D. while

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单项选择题
She' s really the most particular customer we' ve ever met.（）

A. 我们真是从未遇到过像她那么挑剔的顾客。
B. 她真是我们遇到过的最特别的顾客。
C. 我们遇到过的最讲究的顾客就是她。
D. 她是我们遇到过的真正最苛求的顾客。
单项选择题
It is no use（）with him, because he will never change his mind.

A. arguing
B. argue
C. argued
D. to have argued
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