-Do you mind if I open the window? 

-_________

• A、Yes ,please 

• B、No,go ahead

• C、No. please don't 

• D、Yes,you'd better do. 

根據中文提示,把對話中缺少的內容寫在線上。這些句子必須符合英語表達習慣。打句號的地方，用陳述句;打問號的地方，用疑問句。

提示:Lucy要去藝術展覽中心,向一位男士問路，該男士告訴她如何前往。

(L=Lucy;S=Sir)

L: Excuse me ,sir.      51       the Art Exhibition Centre?

S: Yes but it is quite far.It'S about an hour'Swalk.You can take a bus there.

L:           52       ?

S: You can take Bus No. 15.

L:           53         ?

S: About 20 minutes. And you can also take a taxi.

L: Taxi? That'S a good idea. Thank you very much.

S:     54             .

L: Goodbye.

S;       55       . 

He says he has the T-shirt,______I've never seed him wear it. 

• A、after 

• B、since

• C、although 

• D、if