Great efforts to increase agricultural production must be made if food shortage _____ avoided.
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A
is to be
B
can be
C
has been
D
will be
推荐题目
When a pencil is partly in a glass of water, it looks as if it _______. 
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A
breaks
B
has broken
C
were broken
D
had been broken
The old worker has been fired and now a young man ______.
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A
took place
B
has taken the place
C
takes place of him
D
has taken his place
His first novel       good reviews since it came out last month.         
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A
receives
B
is receviing
C
will receive
D
has received
Some of the engines were not suitable for the work they were ________ for.
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A
intended
B
to intend
C
intending
D
being intended