【題目】____ is difficult to know how to ask for help politely.

A. This B. That C. It D. These

【答案】C

【解析】句意：懂得如何禮貌地請求幫助會很困難。A. This這個；B. That那個；C. It 它；D. These這些。句型“It’s+adj.+ to do sth.”意思是“做某事怎么樣”，It為形式主語，不定式是真正的主語，故答案為C。

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