单项选择题

The microscope enables scientists to distinguish a(n)()number and variety of bacteria.

A. selected
B. incredible
C. verifiable
D. unavoidable

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单项选择题

Shoes are often()when they are new.

A. staff
B. stuff
C. stiff
D. stuffy

单项选择题

I promise to look () the matter as soon as I get back to the head office.

A. into
B. in
C. for
D. after

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