单项选择题

Always since the creation of celluloid, plastics have been found to have a multitude of industrial and commercial uses（）

A.Always
B.plastics
C.have
D.multitude

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单项选择题

I could have done it better if I（）more time.

A.have had
B.had
C.had had
D.will have had

单项选择题

I used to think memory ______ were for the hopelessly disorganized, but when I hit mid- 40s it takes three trips between my home and office before I remember why I set out on the journey.

A. problems
B. mistakes
C. lapses
D. faults

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