7．It's quite apuzzle（謎）to us why he did that．

分析 他為何要那樣做對(duì)我們而言真的是個(gè)謎．

解答 答案：puzzle
解析：根據(jù)括號(hào)內(nèi)所給中文提示可知，本題考查puzzle"謎"一詞；由于橫線前面有不定冠詞a，故直接使用所填詞的原形即可．

點(diǎn)評(píng) 本題考查單詞填空，做此類題目時(shí)一定要根據(jù)所給中英文提示確定所填詞，并根據(jù)句意及其它要求判斷所填詞形式是否需要改變．

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