单项选择题

We （） the letter yesterday, but it didn't arrive.

A．must receive
B．must have received
C．ought to receive
D．ought to have received

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单项选择题
I would appreciate （） it a secret.

A．you to keep
B．that you would keep
C．your keeping
D．that you are keeping
单项选择题
George would certainly have attended the proceedings （）.

A．if he didn't get a flat tire
B．if the flat tire hadn't happened
C．had he not had a flat tire
D．had the tire not flattened itself
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