单项选择题

Children may get into some bad habits ______ they lack self-discipline.

A．when
B．unless
C．though
D．until
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单项选择题
When his uncle returned from Hong Kong, the boy asked ______ what present he would get.
A．consciously
B．fluently
C．properly
D．curiously
单项选择题
The smart phone benefits us a lot, but the bad effect ______ has on the youth can not be ignored.
A．that
B．which
C．it
D．one
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