【題目】—Hey,you look worried. What’s up?

—I’m not sure__________

A. that can I pass the exam or not

B. If I can pass the exam or not

C. Whether I can pass the exam or not

【答案】C

【解析】句意:——嘿,你看起來擔(dān)心。怎么啦?——我不確信我是否能通過考試。be not sure不確定,后面接賓語從句用疑問句,whether……or not“是否”,故選C。

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