单项选择题

A．however
B．moreover
C．otherwise
D．therefore
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单项选择题
A．afterB．tillC．beforeD．until
A．after
B．till
C．before
D．until
单项选择题
A．The experiment will take a long time.B．The students should count their time in the lab.C．Dr. Walters teaches biology in the afternoon.D．Biology lab is open one hour every afternoon.
A．The experiment will take a long time.
B．The students should count their time in the lab.
C．Dr. Walters teaches biology in the afternoon.
D．Biology lab is open one hour every afternoon.
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