单项选择题

Although he was ill,______ he went on working.

A．but
B．yet
C．and
D．while
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单项选择题
Not that I'm unwilling to lend you a hand, ______ I'm too busy for the moment.
A．because
B．but that
C．but
D．however
单项选择题
The thief ______ the lock of the lady's jewelry case open.
A．hit
B．forced
C．stole
D．broke
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