单项选择题

______ otherwise directed by a doctor, this medicine should be taken three times a day.

A．Even if
B．Unless
C．Except that
D．As
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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
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
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