Due to bad weather we have to put off until next week to go camping in the mountainsA. i

问题补充：

Due to bad weather we have to put off until next week to go camping in the mountains．

A. it

B. that

C. one

D. this

答案：

(答案→)A. it

B. that

C. one

D. this

解析：考查代词it的用法。在这里it 做形式宾语真正的宾语为后面的不定式，句意：由于坏天气，我们不得不把在山上去野营推迟到下周。故选A。