题目内容

_____ your timely advice,I would never have known how to go about the work.

A. Unless
But for
C. Except for
D. Not for

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He left orders that nothing _____ touched until the police arrived there.

A. should be
B. ought to be
C. must be
D. would be

Which of the following country is not a member of OECD（）

A. Finland
B. Luxembourg
C. Vietnam
D. Italy.

It was recommended that passengers _____ smoke during the flight.

A. not
B. need not
C. could not
D. would not

取样的第一步是明确（）

A. 规定总体
B. 取样的随机性
C. 取样的代表性
D. 合理的样本容量