单项选择题

Every means______since then.

A. has been trying
B. have been trying
C. have been tried
D. has been tried
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单项选择题
—Id like to buy an expensive camer —Well, we have several models for you()


A. to be chosen from
B. of choice
C. to choose from
D. for choosing
单项选择题
The preservation of embryos and juveniles is a ______ occurrence in the fossil re-cord.
A. scarce
B. lack
C. rare
D. short
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