单项选择题

Only when he works harder（）the exam.

A、 Tom can pass
B、 Tom will pass
C、 can Tom pass
D、 was Tom to pass

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单项选择题
It wasn't such a good book（）he had described.

A、 as
B、 that
C、 which
D、 what
单项选择题
（）the cause, they were able to propose to a remedy.

A、 Found
B、 Having found
C、 Have found
D、 Having been found
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