一题填空题求解答?
________ of the number of mountain lions went as high as one million but now there are fewer than one hundred.
(A) Estimations
(B) Estimating
(C) Estimates
(D) Estimatives
关於这一题为什麼是C?
我当初是选B A应该是不可以 因为无字尾tions的用法