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
What______ doing when you______
A．were they; got there
B．they were; arrived there
C．were they; came there
D．they were; reached there
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单项选择题
I opened a letter and it contained______
A．a important information
B．an important information
C．the important information
D．important information
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