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【单选题】
通过调研如实地记录并描述诸如某种产品的市场潜量、顾客态度和偏好等方面的数据资料，我们把这种调研称为()A.
探测性调研
B.
描述性调研
C.
因果关系调研
D.
临时性调研
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【单选题】Not once ______ your sentence correctly.
A.
you have copied
B.
did you have copied
C.
have you copied
D.
have you been copied
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【单选题】Once you _____ the knack of it, you will have no further difficulty.
A.
shall have
B.
had had
C.
are having
D.
have
【单选题】Once you have finished the design, you may have a whole week.
A.
off
B.
down
C.
in
D.
up
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【单选题】Once you have had the disease, you are ______to it for the rest of your life, which means that you cannot get it again.
A.
exempt
B.
immune
C.
unaffected
D.
insusceptible
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