单项选择题

We may often be puzzled by ways of expression that the native speaker of English does not even have to ______ , as English is not our first language.

A．think out
B．think for
C．think over
D．think about
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单项选择题
While in bed the doctor was telephoned to go back to the hospital because of ______ case.
A．a treatment
B．an operation
C．an incident
D．an emergency
单项选择题
He cannot ______ a ear, for he does not earn much money.
A．obtain
B．afford
C．donate
D．consume
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