I think the biggest problem in banning smoking is ______ people can buy cigarettes easily.

A．that B．whether C．where D．how

A

解析試題分析：句意：我認為禁煙最大的問題在于人們可以很輕易地買到香煙。這個句子包含一個表語從句，且引導詞在從句中不作任何成分，也沒有什么實際意義，故用that，選A。
考點：考查表語從句

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