单项选择题

It was from the earliest time ______ men began to study the natural phenomena and heavenly bodies.

A．when
B．where
C．that
D．how
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单项选择题
We were heartedly arguing about the financial matter, （）the telephone rang unexpectedly.

A. while     
B. as      
C, when   
D. as soon as
单项选择题
Please accept our ______ for any inconvenience we have caused.
A．apology
B．apologies
C．apologizes
D．apologetic
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