单项选择题

49()

A.back 
B.aside 
C.about 
D.off

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单项选择题
The idea (that) learning is (a) lifelong process (has expressed) by philosophers and educationalists (throughout) the centuries.()

A. that
B. a
C. has expressed
D. throughout
单项选择题
48()

A.hesitation 
B.surprise 
C.doubt 
D.delay
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