He looked worried because his son" "(miss)

问题描述:

He looked worried because his son" "(miss)

时态一致,故填 was missing

He looked worried because his son is missing.

He looked worries becuase his son was missing.
他看上去着急是因为他的儿子不见了/丢失了
同时从Looked可以看出是过去时态 因此从句也保持过去时态
希望能够帮到楼主

had missed.过去完成时