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1 . I have spared no efforts to remember the words, but all my work was______.
A.in response | B.in decline | C.in return | D.in vain |
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2 . We offer an excellent education to our students. ________, we expect students to work hard.
A.In all | B.At best |
C.In return | D.After all |
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3 . He has given me so much help that I really want to do something for him ______.
A.in return | B.by turns |
C.in turn | D.in total |
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