The new suspension bridge ___by the end of last month.
A．has been designedB．had been designedC．was designedD．would be designed
B
考查時(shí)態(tài)。根據(jù)時(shí)間狀語(yǔ)by the end of last month.到上個(gè)月末可知，用過去完成時(shí)，主語(yǔ)The new suspension bridge與動(dòng)詞design為被動(dòng)關(guān)系，故選B。
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