19．---Does my question sound _______enough？
---I don't think so．You can ask more _______by using"could"instead of"can"．（　�。�
A．politely；politelyB．politely；polite
C．polite；politelyD．polite；polite

分析 ---我的問題聽起來夠有禮貌嗎？---我認為不夠．你可以通過運用"could"代替"can"提問更有禮貌．

解答 答案：C．考查副詞的詞義辨析．句意"---我的問題聽起來夠有禮貌嗎？---我認為不夠．你可以通過運用"could"代替"can"提問更有禮貌．"politely副詞，有禮貌地；polite形容詞有禮貌的．根據(jù)題干Does my question sound _______enough？這里sound是連系動詞，后接形容詞polite作表語；You can ask more _______by using"could"instead of"can"．這里ask是實義動詞，應用副詞修飾動詞．故選C．

點評 理解選項的含義及其詞性，分析句子結構，根據(jù)具體內(nèi)容進行選擇．

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