13．I have no idea ________ is better，so I took _______ of them．（　�。�
A．what，bothB．what，noneC．which，bothD．which，all

分析 我不知道哪個(gè)更好，所以我兩個(gè)都買(mǎi)了．

解答 答案：C，根據(jù)better比較級(jí)可知是兩個(gè)事物進(jìn)行比較，不知選哪一個(gè)，因此引導(dǎo)同位語(yǔ)從句使用which"哪一個(gè)"，第二個(gè)空表示兩者使用代詞both，all用于三者及以上，故答案為C．

點(diǎn)評(píng) 考查不定代詞，應(yīng)對(duì)句子成分進(jìn)行分析，根據(jù)句子語(yǔ)境判斷正確答案．

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