单项选择题

I went there in 1988, and it was the only occasion when I ______ the journey in.exactly two days.

A．must make
B．could make
C．must have made
D．was able to make
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单项选择题
______ in debt to anyone, Tony is very careful about the loans.
A．Never has been
B．Having never been
C．Never being
D．Never having been
单项选择题
In this remote area ______ with a limited number of sheep and cattle.
A．can only a small farm be found
B．a small farm can only be found
C．only could be a small farm found
D．could only be found a small farm
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