单项选择题

John's score on the test is the highest in the Class; he ______ last night.

A．must study
B．should have studied
C．must have studied
D．is sure to study
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单项选择题
______ has recently been done ,to provide more flats for the people, the housing problem in this city is still very serious.
A．What
B．That
C．As a matter of fact
D．In spite of what
单项选择题
The idea of a balanced diet is hard to ______ to those who knows nothing about nutriology.
A．put across
B．put through
C．put down
D．put forward
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