The boy found his bag _____(不见),so he began to cry.

问题描述:

The boy found his bag _____(不见),so he began to cry.

missing /gone

missed

The boy found his bag missing/lost(不见),so he began to cry.
不见了有两种说法
【miss】和【be lost】
这边是非谓语
所以用【missing】和【lost】