题目内容

The atmosphere is as much a part of the earth as ______ its soils and the water of its lakes, rivers and oceans.

A. are
B. is
C. do
D. has

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He must have had an accident, or he ______ here then.

A. should be
B. would be
C. could have been
D. would have been

______ from the hilltop, the lake scenery is beyond description.

A. To see
B. Having seen
C. Seeing
D. Seen

The chemist and Nobel Prize winner ______ seriously injured in a car accident.

A. were
B. was
C. are
D. had been

He set the engine of the car ______.

A. going
B. go
C. to going
D. on going