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
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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
单项选择题
—Each of the students, working hard at his or her lessons, ______to go to university. —So do I.
A．hope
B．hopes
C．hoping
D．hoped
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