—Excuse me. Where is the museum?—It is quite far. It will take you half hour to go there

—Excuse me. Where is the museum?
—It is quite far. It will take you half hour to go there by bus.
A. an; /
B. an; a
C. a; /
D. /; /

A. an; /B. an; aC. a; /D. /; /解析：句意：打扰一下，博物馆在哪？相当远，乘公共汽车去那儿要花半小时的时间。half an hour 半小时，by bus 乘公共汽车都是固定短语。hour中的字母h不发音，第一音是元音，所以用an;by bus 是不用冠词的情况，故选A。

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