Simon made a big bamboo box       the little sick bird till it could fly.
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A
keep
B
kept
C
keeping
D
to keep
推荐题目
He was sent to Australia _______ when he was ten years old.
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A
to be educated
B
to educate
C
educating
D
to be educating
 The machine has been made easier for it____.
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A
to operate
B
operated
C
being operated
D
to be operated