who would've thunk it? idiom informal humorous (also who would've thunk that... ?, who woulda thunk it?, who'd a thunk it?)
谁能想到呢？（表示惊讶，或以幽默的口吻表示一点也不惊讶）
used for expressing surprise, or sometimes in a humorous way when something is not at all surprising
The songwriter, singer and entertainer became a US congressman. Who would've thunk it? 这位作曲家、歌手和艺人成了美国国会议员。谁能想到呢？
Who woulda thunk that cauliflower could actually become addictive? 谁会想到菜花居然会让人上瘾？
Well, another Sherlock Holmes series. Who'd a thunk it? 又是一个福尔摩斯系列。谁能想到呢？