.______ he can finish his task on time is of great importance.
A．WheneverB．IfC．WhetherD．Whichever
C

試題分析：本題考查主語(yǔ)從句。B項(xiàng)if作為“是否”講只能引導(dǎo)動(dòng)詞之后的賓語(yǔ)從句，因而排除；A,D兩項(xiàng)與題意不合。如選A項(xiàng)，原題可改為“…is of no importance”。故答案為C.
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