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
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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
单项选择题
Professor John McMorran's retirement ______ from next semester.
A．takes effect
B．brings effect
C．puts into effect
D．carries into effect
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