问题
选择题
People ______ running everywhere. Do you know what_______? [ ]
A. see; has happened
B. are seen; is happening
C. be seen; has happened
D. see; happens
答案
答案：B
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People ______ running everywhere. Do you know what_______? [ ]
A. see; has happened
B. are seen; is happening
C. be seen; has happened
D. see; happens
答案：B