OG-231

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Ms. Chambers is among the forecasters who predict that the rate of addition to arable lands will drop while those of loss rise.

正確答案: D). the rate of loss rises.

問個有點弱智的問題, 我看得懂OG的解釋, 可是不太明白為什麼這裡"rises"要用一般現在式,

而不是跟前面平行使用 "will rise"?