Shipscarrylifeboats____thecrewcanescape____theshipsinks
A.soasto,if
B.sothat,unless
C.sothat,if
D.inorderthat,incasethat
请大家详细解答分析,谢谢
详细分析BD,为什么不选BD?unlessincasethat可以啊
答案是C
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