单项选择题

Perhaps the day will come（）our city will be without any pollution.

A. when
B. while
C. as
D. what

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单项选择题
Seated in the cinema（）from the watch factory.

A. workers are
B. the workers are
C. that the workers are
D. are the workers
单项选择题
（）in a strange place, Mary fell to（）

A. Lost... cry
B. Losing... crying
C. Lost... crying
D. Having been lost... crying
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