单项选择题

Mr. Black didn't come to office yesterday. He ______ ill.

A．can be
B．must be
C．must have been
D．would be
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单项选择题
It's no use ______ your chickens before they are hatched.
A．counting
B．count
C．to count
D．of counting
单项选择题
The old couple have been married for 40 years and never once ______ with each other.
A．they had quarreled
B．they have quarreled
C．have they quarreled
D．had they quarreled
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