单项选择题
All substances, ______ they are gaseous, liquid or solid, are made of atoms.
A．though
B．whether
C．even if
D．as
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单项选择题
Had I known her name, ______.
A．I would invite her to lunch
B．would I invite her to lunch
C．I would have invited her to lunch
D．would I have invited her to lunch
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单项选择题
You never told us why you were late for the party, ______
A．did you
B．had you
C．didn't you
D．hadn't you
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