英语信再回答给我,按照顺序,题目的要求是这样的：Complete Ben's e-mail to his Net-pal
2个回答

have become

have been studying

for

have been riding

since

have been playing

haven't played

for

has been

have learned

for

have been building

has been working

since

haven't written since

have been lying

for

have had

since

haven't been able

fo

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