问题

ot around quickly_____ a gunman went on a shooting rampage at a movie theatre in Aurora, Colorado
A:had he failed; he realized
B:he had failed; did he realize
C:he had failed; he realized
D:had he failed; did he realize
B:he had failed; did he realize
C:he had failed; he realized
D:had he failed; did he realize
正确答案是:
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