问题

Xiao Li was supposed __________ her homework beforenine o’clock. But she couldn’t.
A:to finish
B:And what willwe be able to do in 2020 or 30 year’s time
C:finish
D:finishing
B:And what willwe be able to do in 2020 or 30 year’s time
C:finish
D:finishing
正确答案是: