14. In 1980 he caught a serious illness from _____ efforts he still suffers.

A. which                       B. that

C. whose                       D. what

這個(gè)題目答案是選C，也就是說后半句應(yīng)該可以換成這樣的說法“ HE STILL SUFFERS THE EFFORT OF THE ILLNESS。” 但是我沒有搞明白這個(gè)句子到底是什么意思。EFFORT在這里應(yīng)該怎么解釋呢？還是“努力”么？