How did it come ----- that humans speak so many different languages?--A.across B,about C.downD.out

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How did it come ----- that humans speak so many different languages?--A.across B,about C.downD.out
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How did it come ----- that humans speak so many different languages?--A.across B,about C.downD.out
How did it come ----- that humans speak so many different languages?--A.across B,about C.down
D.out

How did it come ----- that humans speak so many different languages?--A.across B,about C.downD.out
B,come about发生,产生;实现.相当于不及物动词,在这里that引导的从句是真正的主语,it是形式主语

B