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
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(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。