问题
选择题
People can _____ running everywhere. Do you know what _____?[ ]
A. see, has happened
B. see, happens
C. be seen, is happened
D. be seen, is happening
答案
答案：D
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People can _____ running everywhere. Do you know what _____?[ ]
A. see, has happened
B. see, happens
C. be seen, is happened
D. be seen, is happening
答案：D