They were to produce carbon,nitrogen,water and other gases. [ ]A. in

题型：北京期中题难度：来源：

They were        to produce carbon,nitrogen,water and other gases. [     ]
A. in time
B. at a time
C. at one time
D. on time

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举一反三

He could see the tall buildings      __ .[     ]
A. in the distance
B. in distance
C. from distance
D. to a distance

题型：北京期中题难度：| 查看答案

— Are you really through with your work assigned the day before yesterday?
—        , I"ve only just begun .[     ]
A. On the contrary
B. On the other hand
C. Right you are
D. Never mind

题型：贵州省月考题难度：| 查看答案

The project my students are working is quite challenging because it involves many professional skills. [ ]
A. for which
B. on which
C. of which
D. at which

题型：湖南省月考题难度：| 查看答案

The farm grows various kinds of crops, _______ wheat, corn, cotton and rice.  [     ]
A. for example
B. as
C. so that
D. such as

题型：河北省月考题难度：| 查看答案

They had a pleasant chat _______ a cup of coffee.   [     ]
A. for
B. with
C. during
D. over

题型：河北省月考题难度：| 查看答案