单项选择题


A．hardly
B．unwillingly
C．mostly
D．usually
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单项选择题
A．IfB．AlthoughC．WhenD．Unless
A．If
B．Although
C．When
D．Unless
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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