17．Be sure（相信）that Mary can answer this question．

分析 相信Mary會(huì)回答這個(gè)問題．

解答 答案：Be sure．
根據(jù)提示漢語結(jié)合語境推測(cè)句意是"相信Mary會(huì)回答這個(gè)問題．"，短語"相信"的英文表達(dá)是be sure，根據(jù)設(shè)空處所在的句子是一個(gè)祈使句判斷填動(dòng)詞原形，所以答案是：Be sure

點(diǎn)評(píng) 做這類題型，首先根據(jù)所給漢語明確句子所要考查的單詞或短語的拼寫，再結(jié)合相關(guān)語法知識(shí)對(duì)單詞或短語做出形式上的變化．

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