问题

Oh my god! You ______ wear slippers to attend the conference. — I’m sorry I forgot there is a conference. [ ]
A: must
B: can
C: should
D: shall
B: can
C: should
D: shall
正确答案是:
同类题型
We have hurried all the way to the airport – the flight was called off because of the foggy weather.
30 The elephant I saw in the zoo ate _____ all the things the visitors gave it
Though she is in her nineties, her heart seems to be ______ well.
I really don’t know _________ I put my wallet after I paid the bill.