________ if you want to do something, or you won’t be able to do it well.
A．To try your bestB．Trying you bestC．Try your bestD．Unless you try your best
C
考查非謂語動詞和祈使句。句意“盡最大努力，如果你想做一件事的話，否則你不會做好它。”A表示目的，B表示伴隨；D中的unless不能與if連用。C項是祈使句，符合題意。故選C。
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