have you been to Tianjin?---Twice.
A. How many
B. How many times
C. How
DHow many time
网友回答
A. How many
(答案→)B. How many times
C. How
D. How many time
解析：twice的意思是“两次”。所以根据意思可推断，上句应该是问多少次。time表示“次数”时，是可数名词。所以应该用How many times。而How many“多少”和How“怎样”明显不符合题意。所以本题选B。