問題詳情
B.A greenhouse is a closed environment except 1. the sun's heat entering through the glass or plastic. Of course, there is a water system from outside, and people bring 2. nutrients for the plants and take out the waste material.
【題組】1.
(A) to
(B) that
(C) for
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增