问题
________have you visited the Great Wall?-Once.[ ]
A: How many times
B: How often
C: How soon
D: How long
B: How often
C: How soon
D: How long
正确答案是：
同类题型
The coat is too big _____ me _____ wear. [ ]
Hello! Mrs. Smart! I want to talk _____ you _____ my daughter. [ ]
________ do they live?— In New York.
TV and computer are so popular these days.—Yes，they can our eyes to the outside world.
People, especially teens, think it great fun to surf on Internet.