氯化钡溶液32.33克恰好跟20克的硫酸溶液完全反应．过滤，得到滤液50克，求滤液中HCl的质量分数．

We tried to ring you back，Bryan,  but we think we ______ your number incorrectly.

A． looked up

B． got through

C． took down

D． worked out