1. The manager        a new desk,for he is preparing to apply for a patent these days (design)

那個經(jīng)理一定設(shè)計了一個新的桌子,因為他這幾天正準備著申請專利。

1. must have designed must have done用于對過去的事情進行肯定推測。根據(jù)下文"在申請專利"可知,新桌子已設(shè)計出來了,因此design是過去的動作。

題目來源:高考英語組合訓練多項選擇+完成句子 > 組合訓練57-58

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