单项选择题

Watch your head! You ______ be more careful!

A．may
B．should
C．had to
D．would
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单项选择题
My sister has been working in that factory ever ______ it was set up.
A．since
B．when
C．while
D．fill
单项选择题
The lazy student told his parents a lie ______ they had no class that afternoon.
A．what
B．that
C．which
D．why
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