How much does this pair of trousers cost you?=What( is )the price of this pair of trousers?=How much ( is ) this pair of trousers?填空
price不可数,所以是单数
trousers虽然是复数,但是前面有量词pair限定,所以也是单数
How much does this pair of trousers cost you?=What( is )the price of this pair of trousers?=How much ( is ) this pair of trousers?填空
price不可数,所以是单数
trousers虽然是复数,但是前面有量词pair限定,所以也是单数