Professor Smith, along with his assistants, ________ on the project day and night to meet the deadline.
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A
work
B
working
C
are working
D
is working
推荐题目
The Shanghai Expo has had a major impact upon China. It is the first World Expo _________ in a developing country in the event’s 159-year history.
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A
having been held
B
to hold
C
being held
D
to be held
He stood up, the large door and looked outside. There on the ground lay a white dog.
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A
opens
B
opened
C
opening
D
having opened
. I like getting up very early in summer. The morning air is so good _________.
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A
to be breathed
B
to breathe
C
breathing
D
being breathed
The old man didn’t know whether to sell the car or____ .
#97535
A
being kept for later use
B
kept for later use
C
to keep it for later use
D
to be kept it for later use
He explained the question again to make it easier _______.
#91914
A
to understand
B
understanding
C
understood
D
understand