单项选择题

Mary never tells anyone what she does for a( ).

A．job
B．work
C．profession
D．living
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单项选择题
Why does land become desert after all trees are cut down
A．Because nothing remains on land except floods
B．Because there are no longer trees to keep the rain and protect the top-soil
C．Because too much rain sinks in and washes away the top-soil
D．Because roots of the trees break up the soil
单项选择题
Mary regretted( )to John’s birthday party last Sunday.
A．not going
B．not to go
C．not having heen going
D．not to be going
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