The boy burst into tears he saw his mother.A. at the momentB. in a momentC. for a momentD

问题补充：

The boy burst into tears he saw his mother.

A. at the moment

B. in a moment

C. for a moment

D. the moment

答案：

A. at the moment

B. in a moment

C. for a moment

(答案→)D. the moment

解析：考查连词短语。句中the moment为连词短语，表示“一……就……”，其它短语只可作状语，故选D。