单项选择题

Mary found _______extremely difficult to pass the examination.

A．it
B．this
C．that
D．what
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单项选择题
She was talking about her _______as a nurse in a hospital, which we had never heard of.
A．expenses
B．excuses
C．experiences
D．expressions
单项选择题
Why didn't you _______that pencil which was on the floor
A．pick up
B．bring up
C．get up
D．put up
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