单选题
6.
You should have put the milk in the refrigerator. I expect it ______ undrinkable.
A、
became
B、
has become
C、
had become
D、
becomes
E、
to become
【正确答案】
B
【答案解析】
你应该把牛奶放到冰箱里的。我想，现在牛奶已经不能喝了。
根据题目意思，牛奶并没有被放到冰箱里，因此可能变质，导致不能喝。后半句强调的是对现在造成的结果，所以用现在完成时，故选B。
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