试题：You should have put the milk in the ice-box; I expect it ____undrinkable by now.试题：You should have put the milk in the ice-box; I expect it ____undrinkable by now.A.became B.has become C.had become D.becomes为什么这里不能用 became 也是过去式啊(变了) 为什么非要用现在完成时
问题描述：
试题：You should have put the milk in the ice-box; I expect it ____undrinkable by now.
试题：You should have put the milk in the ice-box; I expect it ____undrinkable by now.
A.became
B.has become
C.had become
D.becomes
为什么这里不能用 became 也是过去式啊(变了) 为什么非要用现在完成时
答
by now 到目前为止
现在完成时时间状语
You should have put the milk in the ice-box是虚拟
你因该把牛奶放冰箱里了对吧,其实没放
所以我才会猜想到他现在已经变得不能喝了,也就是变味了
表示已经发生的事!