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12．- have you been to Xi'an？-Twice．（　　）

A．

How soon

B．

How many times

C．

How often

D．

How long

分析 --你去過幾次西安？--兩次．

解答答案：B．考查頻度．句意"--你去過幾次西安？--兩次．"How soon多快；How many times多少次；How often多久，對頻率提問；How long多長．根據回答Twice．兩次．可知前面問的是你去過幾次西安？問的是次數．故選B．

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