谁能帮我解决这几道英语题,谢谢(初中)

1;beijing is one of the largest cities-----ten million people
a;have b;has c;that have d;have has
这道题选c,为什呀么

2'there is ---beautiful picture on one of---walls of our sitting room
a; a the b;the the c;a / d;the /
这道题选a,为什呀么

3'as well as--part in many organized activities,we'll provide you a good chance to practise your english
a;to take b;took c;taken d;taking
这道题选d,为什呀
回答能详细点么

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