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问题: 单选16

Don't you think _______?
A. smoking is a waste of money
B. it is a waste of money to be smoked
C. it a waste of money of your smoking
D. smoking waste of money

解答:

有个搭配:It's a wast of time/money to do sth."It"在此做形式主语.真正的主语是不定式.
Don't you think 接宾语从句.
这里直接用"somking"做主语了.
把句子还原为:Don't you think (that) smoking is a waste of money ?Don't you think (that ) it is a waste of money to smoke?
BC都是错误的.D缺少谓语.
选A