单项选择题

—The experiment is of particular importance. —I see. We will carry on with it ______ we can get enough money.

A．unless
B．though
C．whether
D．until
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单项选择题
My father is used to smoking and drinking. There’s no chance ______ I’m able to talk him into
A．whether; giving it up
B．of whether; giving them up
C．that; getting rid of them
D．which; stopping it
单项选择题
—Don’t put the waste on the ground, young man.—Oh, I’m sorry. I ______ the dustbin there.
A．hadn’t seen
B．didn’t see
C．can’t see
D．wasn’t seeing
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