单项选择题

Old Americans are extremely reluctant to buy on ______ and likely to save as much money as possible.

A．debt
B．credit
C．deposit
D．sale
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单项选择题
______ with John, George is a much superior engineer.
A．Compared
B．Comparing
C．Having compared
D．To compare
单项选择题
Scientists say it may be five or ten years ______ it is possible to test this medicine on human patients.
A．since
B．when
C．after
D．before
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