－We can’t achieve our dream       we keep        hard.
－I agree with you.
A．until; workB．if; workingC．unless; workingD．unless; work
C

試題分析：句意：---除非我們堅(jiān)持努力工作，我們不能完成我們的夢想。---我同意你的觀點(diǎn)。unless除非，假如不。Keep 后加doing。根據(jù)句意，故選C.
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