单项选择题

______ is not known yet.

A．If this method is better
B．Whether this method is better
C．If this method is better or not
D．Whether this method better
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单项选择题
You ______ your own sandwiches. I have enough for two.
A．couldn't have brought
B．shouldn't have brought
C．mustn't have brought
D．needn't have brought
单项选择题
I would appreciate ______ it a secret.
A．you to keep
B．you keep
C．your keeping
D．that you are keeping
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