问题

It’s ten years since the scientist _______to discoverthe valuable chemical.

A:kept up
B:set out
C:took in
D:set about

正确答案是：

同类题型

______ does this scarf belong to— Let me see. Oh, it may be ______.

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’t want to eat it unless he’s reallyhungry, in ______ case he’ll eat almost anything

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