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Some people are worrying about the possibility ________ mobile phones could be responsible for a range of illnesses, from rashes(皮疹) to brain tumors．
A．thatB．whyC．howD．whether
A

這題考查that引導同位語從句，修飾possibility，句意是：一些人擔心手機有可能會導致一系列疾病，皮疹和腦腫瘤。選A。
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