At the United Nations Climate Change Conference, the UN Secretary General points out that，________， the climate situation will get worse and worse.
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A
if not dealing with properly
B
unless dealing with properly
C
if properly dealt with
D
unless properly dealt with
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It was because he was seriously ill _________ he was late for school.
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A
that
B
which
C
so
D
what
—All the building materials have been washed away.—So I have heard. But there was no sign ____ a heavy rain was on the way last night.
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A
when
B
that
C
which
D
If
Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.(2011·江西)
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A
whenever
B
however
C
whichever
D
wherever
He wishes to make friends with ____ shares his hobbies and interests.
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A
whoever
B
no matter who
C
whoever
D
anyone
This photo of mine was taken__________ stood the famous high tower.
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A
which
B
in which
C
where
D
there