单项选择题
It is() to stare directly at the sun.
A.harmful
B.harmless
C.comfortable
D.safe
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单项选择题
Mr.Cookhasnotcommented()thesereports.
A.in
B.of
C.with
D.on
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单项选择题
NosoonerhadhearrivedinRome()heheardofthegoodnews.
A.when
B.than
C.then
D.until
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