–Who is the man talking to the headmaster? –A professor ________ a visit to our school.
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A
pays
B
is paying
C
paid
D
paying
推荐题目
 In the USA, he made a lot of friends ______ English well to make himself ______.
#97969
A
learn; understand  
B
to learn; understood
C
learning; understand
D
learned; understood
________ the important documents were needed_______.
#90795
A
Where; finding
B
What; found
C
When; to find
D
When; to be found
 ________ time, he’ll make a first-class tennis player.
#90456
A
Having given
B
To given
C
Giving
D
Given
Once ___, it can never be forgotten.
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A
see
B
to be seen
C
seen
D
saw
______ around the Water Cube, we were then taken to see the Bird’s Nest.
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A
Having shown
B
To be shown
C
Having been shown
D
To show