单项选择题

Only after （） requests by the tenants did the superintendant do something about the broken intercoms in some of the apartments.

A.repeat
B.repeated
C.repeating
D.repetition

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单项选择题

All commuters （） the main highway to get to the center of the city will face delays of up to an hour today because of on-going construction.

A.use
B.used
C.using
D.will use

单项选择题

One of the reasons why our sales team has become a leader today is that they are put through a number of vigorous training sessions to keep up with the （） changes that occur in the market.

A.prosperous
B.continuous
C.straight
D.mature

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