题目内容

The decision had taken about 10 seconds ________________ read a market research study.

A. once he'd
B. once he's
C. once he'll
D. once he'd better

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___________ understand this rule, you will have on further difficulty.

A. Once you will
B. Once you had
C. Once you would
D. Once you

Once you __________ to do something, you should do it well.

A. has decided
B. have decided
C. have been decided
D. decided

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直埋布线法根据选定的布线路由在地面上，然后将直接埋在沟内。