Researchers found that hospital workers who wore watches \_\_\_\_ more bacteria on their wrists than those who went watchless. Ⓐ exposed Ⓑ harbored © sailed ᴰ obstructed 二、文法(共7題,計14分)
Aexposed
Bharbored正確答案
Csailed
Dobstructed
答案與詳解
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