单项选择题

No other drug is available at present______ can produce the same therapeutic effect with less risk.

A．that
B．than
C．when
D．as
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单项选择题
Many foreign students come to study in the U.S., some ______ by scholarships, others by the U.S. government' s Agency for International Development, by the Ford Foundation, and so on.
A．to be supported
B．being supported
C．are supported
D．having been supported
单项选择题
He resented ______to wait, he expected the minister______ him at once.
A．being asked to, to see
B．to be asked, to see
C．to be asked, seeing
D．being asked, seeing
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