单项选择题

Nine is to three ______ three is to one.

A. when
B. that
C. which
D. what
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单项选择题
Teddy came to my ______ with a cheque of $200 to pay my room rate, after I phoned him that my wallet had been stolen．
A．attendance
B．assistance
C．rescue
D．safety
单项选择题
Keep this reference book; it may come in ______ one day.
A. handy
B. useful
C. convenient
D. helpful
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