问题
选择题
Be careful when you deal with this chemical, as it will explode when _____ to sunlight. [ ]
A. being exposed
B. to expose
C. exposing
D. exposed
答案
答案：D
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Be careful when you deal with this chemical, as it will explode when _____ to sunlight. [ ]
A. being exposed
B. to expose
C. exposing
D. exposed
答案：D