单项选择题


A．If
B．Although
C．When
D．Unless
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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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