单项选择题

I was very sleepy. I tried ______ my eyes open but I couldn't.

A. keeping
B. having kept
C. to have kept
D. to keep
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单项选择题
Subways are underground systems of high speed trains, which are mostly found in large cit ies: New York, London, and Tokyo.
A.地铁是地下的高速火车系统，主要出现在像纽约、伦敦和东京这样的大城市。
B.地铁是地下的火车系统，主要出现在像纽约、伦敦和东京这样的大城市。
C.地铁是地下的高速火车系统，主要出现在像纽约、伦敦和北京这样的大城市。
D.地铁是在地下的高速运行的火车，主要出现在像纽约、伦敦和东京这样的大城市。
单项选择题
Where did the town doctor examine the farmer
A. In the village.
B. On the farm.
C. In the consulting room.

D. In the city.
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