摘要：17．Don’t promise anything you are one hundred percent sure． A．whether B．after C．how D．unless
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Don’t promise anything ________ you are one hundred percent sure．
[ ]
A．whether
B．after
C．how
D．unless
Don’t promise anything ________ you are one hundred percent sure．
[ ]
A．whether
B．after
C．how
D．unless
Don’t promise anything ________ you are one hundred percent sure．
[ ]
A．whether
B．after
C．how
D．unless