China’s first manned spaceship “Shenzhou Ⅴ” was sent up into space on October 15 and returned safely to the earth on October 16,______ is a great honour for our great motherland.A.thatB.whichC.whatD.it
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B解析此题考查关系代词的用法。which引导非限制性定语从句，which在定语从句中作主语，指代前面整个主句。