________ on ten years of observation and study, Professor Wang announced that everyone dreams every night，whether they realize it or not.
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A
Basing
B
Based
C
Been based
D
Having based
推荐题目
（2014山东省实验中学高三第二次模拟考试）9．The publishers are confident that the books ______________ next month will sell well．
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A
published
B
to be published
C
having published
D
are published
It is worthwhile considering what makes “convenience” foods so popular, and____ better ones of your own.
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A
introduces
B
to introduce
C
introducing
D
introduced