连词成句,并用相应的时态1.be,he,Africa,for,to,three times2.a letter,she,call,I,write,when

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连词成句,并用相应的时态
1.be,he,Africa,for,to,three times
2.a letter,she,call,I,write,when

1.He has been to Afica three times.他去过非洲三次
2.When I was writing a letter,she calles.
= She called when I was writing a letter.当我在写信时,她打来了电话