Linda has lost her wallet again. It is the second time this _____.
本题考查的是固定句型:It is the...time that...has done…,即:这是第……次做……。that后的从句要用完成时,而happen不用于被动语态,故选A。本句的意思是:“琳达又丢了钱包。这是第二次发生这种事了。”
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