问题

.________ to the trial, this small electronic device was only developed for military use.

A:Superior
B:Fundamental
C:Previous
D:Accessible

正确答案是：

同类题型

．Theproblem ________now is very important．

Is it in Zhou Qu _________ the terrible mudslide happened two months ago, killing more than one thousand people?

The engine _______ smoke and steam.

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