They will lose the game ______they try their best.
A．unlessB． whenC．sinceD． after
A

試題分析：句意:除非他們盡他們的最大努力，否則他們將會(huì)丟掉這場(chǎng)比賽。unless除非，如果不，引導(dǎo)條件狀語從句；when 當(dāng)……時(shí)候，引導(dǎo)時(shí)間狀語從句；since 自從，引導(dǎo)時(shí)間狀語從句；after 在……之后，引導(dǎo)時(shí)間狀語從句。根據(jù)句意可知選A。
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