单项选择题

This is the second time that John __________ in his final exam.

A. has failed
B. fails
C. failed
D. failing
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The world ______ we live is made up of matter.
A. on which
B. of which
C. at which
D. in which
单项选择题
The clock, ______ my great grandfather bought, is still in good order.
A．which
B．that
C．as
D．who
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