Question

【题目】You're supposed ______ your room up before you go out.
A.to clean
B.clean
C.cleaning

Answer 1

【答案】A
【解析】句意:在你们出去之前，你应该把你的房间清整干净。A.动词不定式;B.动词原形;C.动词的ing形式。be supposed to do sth;应该做某事。结合句意及结构，故选A。