OldJohncannothearwell，sothesalesmanistryingtoexplainhow...

问题详情：

Old John cannot hear well，so the salesman is trying to explain how to use the product _____ sign language．（　　）

A．by means of       B．on behalf of C．in search of D．for fear of

【回答】

A

知识点：词组 短语

题型：选择题