单项选择题
This is the reason ______I have not done my homework.
A．where
B．when
C．which
D．why
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单项选择题
They have not decided ______for their holiday.
A．where to go
B．where they to go
C．where will they go
D．they will go where
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单项选择题
I want to know______ she has gone to the factory or not.
A．if
B．when
C．whether
D．that
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