20．I have sent her the invitation butwhethershe will accept it I don't know．

分析 我已經(jīng)給她發(fā)了請(qǐng)柬，但是我不知道她是否會(huì)接受．

解答 答案是whether．本題考查引導(dǎo)賓語(yǔ)從句是引導(dǎo)詞；題干中but連接的并列分句中___ she will accept it充當(dāng)know的賓語(yǔ)，根據(jù)句意，我不知道她"whether是否"接受，故答案是whether．注意，if可以引導(dǎo)賓語(yǔ)從句，表示"是否"，但通常不放在句首．

點(diǎn)評(píng) 單詞填空必須在對(duì)語(yǔ)境和句子結(jié)構(gòu)整體理解的基礎(chǔ)上抓住指向答案的關(guān)鍵線索、固定句型或搭配等，同時(shí)注意所選詞的形式變化．本題考查whether 引導(dǎo)的賓語(yǔ)從句．

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