帮 我分析几道英语题目，高三的。谢谢

1.A rough estimate, Nigeria is__________ Great Britain.
A. three times the size as B. the size three times of
C. three times as the size of D. three times the size of
2.______ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
A. Put B. Putting C. Having put D. Being put
3. It was unbelievable that the fans waited outside the gym for three hours just _______ a look at the sports stars.
A. had B. having C. to have D. have
请说明理由，谢谢啦！！！！！！！！！！！！！！

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