单项选择题

In order not to be disturbed, I spent three hours ______ in my study.

A．locking
B．locked
C．to lock
D．being locked
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单项选择题
--What do you think of the songs --In fact ______ of them sounds beautiful.
A．not all
B．no one
C．not everyone
D．not every one
单项选择题
______ the punishment was unfair, he accepted it without complaint.
A．So long as
B．Even though
C．Since
D．While
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