问题补充:
Be careful when you deal with this chemical, as it will explode when to sunlight.
A. exposed
B. to expose
C. exposing
D. being exposed
答案:
(答案→)A. exposed
B. to expose
C. exposing
D. being exposed
解析:考查非谓语动词。本题考查短语be exposed to暴露与……。句意:处理这种化学物质时要小心,因为它暴露在阳光下时会爆炸。故A正确。