Question

Jack became seriously ill after ________ in polluted air for many years.

A．breathed

B．breath

C．breathing

D．to breathe

Answer 1

C

试题分析：句意：Jack在呼吸了很多年被污染的空气后，病的很严重。Breath与其逻辑主语Jack之间是主动关系，故用现在分词作原因状语，选C。