You should have put the milk into the icebox, I expect it undrinkable.
A. became
B. had bee
C. has bee
D. bees
网友回答
A. became
B. had bee
(答案→)C. has bee
D. bees
解析：本句的意思是：你本该把牛奶放到冰箱里，我想现在这牛奶不能喝了。本句的难点是：从句意分析，牛奶已经变质，不能喝了，属过去发生的动作对现在造成影响，再加上by now是现在完成时的典型时间状语，故选[C]。