—I'm not sure__________ Mr Wang goe-考呗网

单选题—I'm not sure__________ Mr Wang goes to see his parents.
—Twice a week.
[A]how long
[B]how often
[-C]how soon

考查疑问副词的用法。由答句可知，前一句提问的是频率，因此选how often。[A]用于提问时间、长度；[C]用于提问时间，指“多快，多久”。

1__________ Let's go out for a picnic this Sunday.
[A]That's a good idea
[B]That's all right
[C]That's OK

2——__________you ever__________to Hong Kong?
——Yes，twice．
[A]Have；gone
[B]Have；been
[C]Were；going

3__________we cook our meal，__________we go out for dinner.
[A]Both;and
[B]Either；or
[C]Neither；nor