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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单项选择题
The children are having a good time,______ with sand, others with toys.
A．some of them playing
B．who playing
C．some of whom are playing
D．some of them
单项选择题
______ it with me and I'll see what I can do.
A．When left
B．Leaving
C．If you leave
D．Leave
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