He wrote a letter___he explains what had happenedHe wrote a letter___he explains what hadhappened in the accident.

He wrote a letter___he explains what had happenedHe wrote a letter___he explains what hadhappened in the accident.
He wrote a letter___he explains what had happened
He wrote a letter___he explains what had
happened in the accident.

He wrote a letter___he explains what had happenedHe wrote a letter___he explains what hadhappened in the accident.
in which 或者是where.选C
全文是He wrote a letter （where） he explains what had happened in the accident.
单独看从句就是He explains what had happened in the accident (in the letter).把letter提前做出定语从句.介词和关系词组成的定语从句,介词in不能省略.这也是该题的考点.
附注：in which=where

in which

应该是that

that在a，b，c，d选一
a，what
b,which
c,where
d,howb帮帮忙

He was writing a letter___ pen.A.in B.in a C.with D.use.填什么 为什么急 who wrote the letter to you?改被动 who was the letter___ to you ____? I am Chinese,but I can write a letter___ he wrote a letter to me last year.对wrote a letter to me 划线提问 He wrote for a newspaper last year.对wrote for a newspaper提问.Thanks. After he lost his arm,he wrote a book.改同义句 ____ ____ his arm,he wrote a bookAfter he lost his arm,he wrote a book.改同义句 ____ ____his arm,he wrote a book wrote a He wrote a report on a minor English poet. that night he wrote a letter to a newspaper. He [wrote] a diary yesterday. 括号中为什么用wrote. 请解析. He wrote a letter last night.改为一般否定句 he wrote a letter to his friend改为否定句 He wrote a letter of ________ (invite) to his friends. wrote he a yesterday letter 连词成句 he wrote a letter in pencil,为什么用in He wrote a s______ of books about Chinese life. he wrote a letter just now .的同义句. He wrote a book ________his trip to Australia