He left orders that nothing _____ touched until the police arrived there.
A. should be
B. ought to be
C. must be
D. would be
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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
She asked that she _____ allowed to see her son in police custody.
A. would be
B. could be
C. be
D. was
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