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【单选题】

Nine in ten high school students say there are significant differences in their attitude toward chatting on line, compared with _________ of their parents.

A.
those
B.
that
C.
it
D.
one
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举一反三

【单选题】All of them have ___ smoking.

A.
give up
B.
gave up
C.
given up
D.
to giving up

【单选题】The young lady was careful _________.The young lady was careful _________.

A.
not repeating her mistake
B.
not repeated her mistake
C.
to not repeat her mistake
D.
never to repeat her mistake

【单选题】Black clouds had completely ___ the sun.

A.
blocked off
B.
broken out
C.
blocked out
D.
broken off