In spite of the great difficulties, Helen Keller ______ studying and finally succeeded. 
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A
stuck to
B
kept up with
C
kept on
D
insisted on
推荐题目
If the machine should ______, call this number immediately.
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A
break down
B
set out
C
put on
D
go up
The man fell , his hand still ___________.
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A
rose
B
raised
C
risen
D
raising
The committee ___________ nine members.
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A
is consisted of
B
consists of
C
is included
D
is made of