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
—What do you think made Mary so upset —her new bicycle.
A．As she lost
B．Lost
C．Losing
D．Because of losing
单项选择题
The letter they looked forward to______ at last.
A．arrive
B．arrived.
C．arriving
D．had arrived
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