Question

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

Answer 1

A

试题分析：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。