The fire was finally brought under control, but extensive damage _________. 
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A
is caused
B
was causing
C
had caused
D
had been caused
推荐题目
This is the best dinner that I________.
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A
enjoyed
B
have enjoyed
C
had enjoyed
D
enjoy
By the end of this year, 160 new students ___ in the English Department of this world famous university.
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A
have enroll
B
will have enrolled
C
have been enrolled
D
will have been enrolled
--- Why does the lake smell terrible?--- Because large quantities of water _________.
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A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted