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【单选题】
决定民俗产生发展和存亡的根本原因是（）A.
经济原因
B.
政治原因
C.
地域原因
D.
宗教原因
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【单选题】Jack wasn't saying anything,but the teacher smiled at him ___ he had done somethingvery clever. [ ]
A.
as if
B.
in case
C.
while
D.
though
【单选题】Jack wasn't saying anything，but the teacher smiled at him ________ he had done something very clever.(2011·湖南)
A.
as if
B.
in case
C.
while
D.
thought
【单选题】Jack wasn't saying anything, but the teacher smiled at him ________ he had done something very clever.(2011·湖南)
A.
as if
B.
in case
C.
while
D.
though
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