You can have a good view of Nanjing at the top of Zijin Mountain ______ a clear day.
#48011
A
at
B
on
C
in
D
for
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Sally has been swimming ______ four hours.   
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A
for about
B
since
C
about
D
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Smoking will_______ your health.
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A
be good for
B
good at
C
be bad for
D
bad at