—What do you think of genetically modified food (转基因食品)? —We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.
#47017
A
that, for
B
it, for
C
it, of
D
that, of
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My sister has learnt English .
#47780
A
for twelve years ago
B
since she was four
C
twelve years ago
D
at the age of four
Sanya is a beautiful city. There are many people here _________vacation every year.
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A
in
B
on
C
for
D
to