单项选择题

You may borrow the book, ______ that you do not lend it to anyone else.

[A] on occasion
[B] on condition
[C] on purpose
[D] only if
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Living in the central Australian desert has its problems, ______ obtaining water is not the least.
[A] for which
[B] to which
[C] of which
[D] in which
单项选择题
There has been a great increase in retail sales, ______ .
[A] does there
[B] isn't there
[C] hasn't there
[D] isn't it
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