单项选择题

Tom's score on the English test is the lowest in his class; he ______ have studied very hard.

A．may
B．must
C．should
D．can
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单项选择题
It is necessary that a student ______ his lesson before coming to class.
A．will prepare
B．prepares
C．must prepare
D．prepare
单项选择题
______ right at the traffic lights, you will see a red building.
A．Turn
B．To turn
C．Turning
D．If turned
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