单项选择题

scientists identified water shortage and global warming as ______ problems.

A.the two most worrying
B.the two most worried
C.the most two being worried
D.the most two being worrying
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单项选择题
Toast and marmalade ______ a popular breakfast food.
A.be
B.are
C.being
D.is
问答题
He didn’t permit me ______.A.explainingB.explainedC.explainD.to explain
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