单项选择题

He underwent four ______ operations in two weeks.

A．excessive
B．extensive
C．intensive
D．successive
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单项选择题
With an eighty-hour week and little enjoyment, life must have been very ______ for the nineteenth-century factory workers.
A．hostile
B．anxious
C．tedious
D．obscure
单项选择题
Since 1970, millions of enthusiasts ______ a substance which they believe can remedy the common cold — Vitamin C.
A．have taken
B．have been taking
C．have been taken
D．have being taken
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