单项选择题

Oil（）90 per cent of the country's exports.

A、 consists of
B、 reaches
C、 accounts for
D、 composes

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单项选择题
（）him do this job by himself

A、 Why don't let
B、 Why not let
C、 Why not letting
D、 Why you not let
单项选择题
Allen said that he won't mind（）

A、 to wait for us
B、 for waiting us
C、 him waiting for us
D、 wait for us
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