单项选择题

Much to the student's ______ , the exam was postponed.

A．burden
B．concern
C．relief
D．requirement
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单项选择题
It may be concluded that the vitamins people choose to take are often not the ______ lacking in their diet.
A．ones
B．some
C．few
D．many
单项选择题
______ a raining day, we didn't go for an outing.
A．Being
B．It being
C．To be
D．Having been
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