Mary should have put the fish in the refrigerator. I bet it ______ uneatable by

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问题 Mary should have put the fish in the refrigerator. I bet it ______ uneatable by now.

选项 A、becomes
B、has become
C、will become
D、had become

答案 B

解析 should have done表示“过去本应该做某事却未做”，通常有责备的意思。后面的句子为前面的行为引起的结果，用现在完成时。by now到如今。

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