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【单选题】
下列要素中可以确立决策方向的是（）。A.
决策目标
B.
备选方案
C.
备选方案的选择
D.
备选方案的最终抉择
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【单选题】— _____ have you been learning English? — I have been learning English for six years. [ ]
A.
How long
B.
How often
C.
How far
【单选题】—Oh, you have a headache and a cough.______ have you been like this? —Two days. [ ]
A.
How many
B.
How long
C.
How often
【单选题】—How many times have you been to China? —In fact, it is the first time I __________ here.
A.
have been
B.
am
C.
had been
D.
was
【单选题】—Oh, you have a headache and a cough. __________ have you been like this? — Two days.
A.
How long
B.
How often
C.
How old
D.
How many
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