You kept me _______so long. [ ]A. waiting B. to wait C. am waiting D. wait

题型：期中题难度：来源：

You kept me _______so long.

[ ]

A. waiting
B. to wait
C. am waiting
D. wait

答案

举一反三

I saw the boys _______ football in the gym when I passed by yesterday afternoon.

[ ]

A. play
B. to play
C. plays
D. playing

题型：期中题难度：| 查看答案

Look! There are some workers _____ in the factory.

[ ]

A. to work
B. work
C. working
D. are working

题型：期中题难度：| 查看答案

The thief was caught by the police, with his hands _____ behind his back.

[ ]

A. being tied
B. having tied
C. to be tied
D. tied

题型：期末题难度：| 查看答案

You should make your idea ________.

[ ]

A. know
B. known
C. to know

题型：期末题难度：| 查看答案

There are several chemical factories _______ waste water into the river.

[ ]

A. pouring
B. pour
C. to pour

题型：期末题难度：| 查看答案