If____________ , the polluted air can result in deadly diseases or even death.A．

题型：不详难度：来源：

If____________ , the polluted air can result in deadly diseases or even death.

A．being breathed in	B．having been breathed in
C．breathed in	D．breathing in

答案

解析

略

举一反三

Seeing that the old lady had no chair ___, the boy offered her his own.
A, to sit B to be seated C. to seat herself D. to sit on

题型：不详难度：| 查看答案

This school, _____ for two years ,is intended for the disabled children .
A being built B having built
C having been built D was built

题型：不详难度：| 查看答案

When the traveler felt tired, he stopped ___.

A．drink

B．to drink

C．drinking

D．drunk

题型：不详难度：| 查看答案

Watch the man ___ it. And you should do ti in the same way.

A．do

B．to do

C．doing

D．done

题型：不详难度：| 查看答案

Professor Johnson is said _____ some significant advance in his research in the past year.

A．having made

B．making

C．to have made

D．to make

题型：不详难度：| 查看答案