单项选择题

______ the temperature falling so rapidly, we couldn't go on with the experiment.

A．Since
B．For
C．As
D．With
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She ought to stop work: she has a headache because she______ too long.
A．has been reading
B．had read
C．is reading
D．read
单项选择题
Being a pop star can be quite a hard life, with a lot of travelling ______heavy schedules.
A．with regard to
B．as to
C．in relation to
D．owing to
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