The engineers made two big plans for the dam, ____ was never put in force. 
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A
one of them
B
which
C
one of which
D
every one of which
推荐题目
Not only_______polluted but_______crowded.
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A
was the city;were the streets
B
the city was;were the streets
C
was the city;the streets were
D
the city was;the streets were
Last week, only two people came to look at the house, _____wanted to buy it.
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A
none of them
B
both of them
C
none of whom
D
neither of whom
There comes a time in every man's life_____. 
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A
that he needs to think
B
when he has to think
C
therefore he has to work hard
D
then he will need it
All __________ can be done has been done.
#69908
A
which
B
that
C
/
D
what