题干
— What are you going to do this Sunday?
— I don't know because I'm __________ if it is sunny that day.
A：sure
B：not sure
C：think
D：believe
答案(点此获取答案解析）
B
— What are you going to do this Sunday?
— I don't know because I'm __________ if it is sunny that day.
A：sure
B：not sure
C：think
D：believe
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