单项选择题

______ on time according to the instruction, these pills will be quite effective.

A．Taking
B．Being taken
C．Taken
D．Having taken
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单项选择题
______ experiments on the laboratory, it started to rain heavily.
A．While performing
B．Performing
C．While I was performing
D．To perform
单项选择题
They were enjoying themselves. ______, they appeared to be enjoying themselves.
A．However
B．Or rather
C．Furthermore
D．As a result
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