—Dad, when shall we go to visit my grandpa?
—Grandpa is very busy at present．We'll go to see him whenever __________.
A．he is convenientB．he will be convenient
C．it is convenient to himD．it will be convenient to him
C
首先，若用convenient表示“某人方便”之意，絕對(duì)不能使用人作主語(yǔ)，而應(yīng)使用it，由此排除A、B選項(xiàng)，類似地，possible等形容詞也不能以人作主語(yǔ)，應(yīng)使用it作主語(yǔ)。此外，由whenever引導(dǎo)的時(shí)間狀語(yǔ)從句遵循的是“主將從現(xiàn)”原則，由此判斷答案為C
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