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一道英语选择PeterreceivedaletterjustnowhismotherwouldcometoseehimsoonA:saidB:sayC:sayingD:tosay要有分析,为什么不能用said

题目详情
一道英语选择
Peter received a letter just now _____his mother would come to see him soon
A:said B:say C:saying D:to say
要有分析,为什么不能用said
▼优质解答
答案和解析
C这个是伴随状语,用doing