17．We go to the school librarytwice （two） a week．

分析 我們每周去學(xué)校圖書館兩次．

解答 答案：twice．
根據(jù)We go to the school library--（two） a week．可知我們每周去學(xué)校圖書館兩次．這里twice a week表示一周兩次，在這里表示頻率，twice，兩次．故填twice．

點(diǎn)評(píng) 本題考查用所給單詞的適當(dāng)形式填空，首先要根據(jù)語境明確句意，然后再根據(jù)相關(guān)語法對(duì)所給單詞在形式上做出正確的變化．

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