单项选择题

John isn't a diligent student, for it is the third time he has been late, ______

A．wasn't
B．hasn't it
C．isn't it
D．hasn't he
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单项选择题
After the company______ the problem of unfair competition, its sales figures dropped to a record low.
A．look into
B．ran into
C．come into
D．put into
单项选择题
His written English was first-class, and he had a(n)______ vocabulary for a sophomore.
A．intimate
B．initial
C．inevitable
D．incredible
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