【題目】As we know, one can never imagine how great he is _________he tries his best to solve something.

A.sinceB.whenC.unless

【答案】C

【解析】

句意:我們知道,一個人除非他盡力解決問題,否則永遠(yuǎn)無法想象他有多偉大。

考查連詞辨析。since自從;when何時; unless除非。根據(jù)下文“he tries his best to solve something. 他盡力解決問題,可知這里是條件狀語從句。unless除非,如果不。根據(jù)題意,故選C。

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