单项选择题

Toast and marmalade ______ a popular breakfast food.

A.be
B.are
C.being
D.is
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问答题
He didn’t permit me ______.A.explainingB.explainedC.explainD.to explain
单项选择题
______ allow the vegetables to go bad, he sold them at half price.
A.Not
B.Unless
C.Would not
D.Rather than
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