题目内容
—_____ do you go to the zoo with your brother?
—Three times a month.
| A．How long | B．How often | C．How old | D．How much |
B
解析试题分析：句意：你和你哥哥多久去一次动物园？一个月三次。根据答语可知上句是提问频率。A多久，问时间段，B多久一次，C多大了，问年龄，D多少，问价格。故选B.
考点：考查冠词的用法。
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