单项选择题

Mary has got a full mark in the test. She ______ very hard all these days.

A．will work
B．could have worked
C．may work
D．must have worked
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单项选择题
______ much of their land is poor and only ten percent of the land can be cultivated, over ninety percent of the population are agricultural workers.
A．Except
B．Because
C．Although
D．So far as
单项选择题
I felt somewhat disappointed and was about to leave ______ something occurred which attracted my attention.
A．unless
B．when
C．until
D．while
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