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That was a difficult question, but Mary still （） to work it out.
That was a difficult question, but Mary still （） to work it out.
A.did
B.failed
C.kept
D.managed
正确答案：D
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It is a puzzle to me that Steve who has been working （） wants to quit the course. A.diligently
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So little （） about chemistry that the lecture was completely beyond me.