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
Because there is evidence of severely harmful effects from chemical dumps, the government has ______tougher cleanup measures.
A．imposed
B．impulsed
C．implemented
D．incorporated
单项选择题
He is now in London, but he missed his parents,______ enjoy the exciting life there.
A．so much as to
B．very much to
C．so much to
D．too much to
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