问题
It wasn’t until the 2010 CCTV Spring Festival Gala (央视春晚) _____.[ ]
A: did the former pop band Little Tiger reunite
B: that the former pop band Little Tiger reunited
C: then did the former pop band Little Tiger reunite
D: when the former pop band Little Tiger reunited
B: that the former pop band Little Tiger reunited
C: then did the former pop band Little Tiger reunite
D: when the former pop band Little Tiger reunited
正确答案是：
