(单选题) —Have you finished the work? ( ) —Not yet, but no matter how hard it is, we.ll keep ___ until we make it. (本题3.5分) A、 failed B、 trying C、 tried D、 failing

(单选题) —Have you finished the work? ( )
—Not yet, but no matter how hard it is, we.ll keep ___ until we make it.
(本题3.5分)
A、 failed
B、 trying
C、 tried
D、 failing

出自：内蒙古农业大学-大学英语4

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