20．A lot of people joined the clubto participate（participate） in community service projects．

分析 為了參與社區(qū)服務(wù)項(xiàng)目很多人加入這個(gè)俱樂部．

解答 答案是to participate．本題考查語(yǔ)境中選用所給詞的恰當(dāng)形式；題干中需要?jiǎng)釉~不定式表示人們加入這個(gè)俱樂部的"目的"，故答案是to participate．

點(diǎn)評(píng) 本題是要求用所給動(dòng)詞的適當(dāng)形式填空，解題時(shí)首先考慮句中需要的是謂語(yǔ)動(dòng)詞還是非謂語(yǔ)動(dòng)詞；其次，如果是謂語(yǔ)動(dòng)詞關(guān)注時(shí)態(tài)、語(yǔ)態(tài)和數(shù)的變化；如果是非謂語(yǔ)動(dòng)詞要聯(lián)系非謂語(yǔ)的基本用法判斷非謂語(yǔ)的形式．

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