单项选择题

I ______ him the Christmas gift by mail because he came home during the Christmas holidays.

A．ought to have sent
B．couldn’t have sent
C．must have sent
D．needn’t have sent
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单项选择题
If the scheme is ______ carried out without waste of time or energy I shall be completely satisfied.
A．relatively
B．noticeably
C．appropriately
D．efficiently
单项选择题
There is ______ evidence to show that other factors contribute to soil formation.
A．acute
B．agreeable
C．ample
D．attendant
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