These young orange trees need special care they can live through winter .A. forB. because

问题补充：

These young orange trees need special care they can live through winter .

A. for

B. because

C. so that

D. unless

答案：

A. for

B. because

(答案→)C. so that

D. unless

解析：so that 表示以至于… 引导结果状语从句。