They will lose the game _______ they try their best.
A．unlessB．onceC．sinceD．a(chǎn)fter
A

試題分析：句意:除非他們盡他們的最大努力，否則他們會輸?shù)舯荣悺nless 除非，如果不；once 一旦，曾經(jīng)，一次；since自從；after 在…之后。根據(jù)句意可知選A。
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