____ she came in,i was writing a letter A when B while C sin

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____ she came in,i was writing a letter A when B while C since D where

A
题意：她进来时,我正在写信.
再问： ____ there is no rain,it's difficult to plant trees A where B when C which D How 到底选 A,还是B？？就这一题了！！好了就采纳！~\(≧▽≦)/~啦啦啦今天晚上做好！
再答： B when在此引导时间状语从句，但有条件的意义。题意：如果没有雨水，植树不有点困难了。

____ she came in,i was writing a letter A when B while C sin 答对给财富 1.（）she came in,l was writing a letter A.When B.While I was writing a letter when she called. He was still ____ when I came in.A.sleeping B.sleepy C.aslee _______(When/While) Marry was writing a letter ,the children I'm writing a letter ____ my friend. A.to B.for C.at D.on The letter is ____ in French.I cannot read it.A.writing B.wr ( )we were having breakfast,he came in.A.while B.when C.afte She was not happy----she saw her mother A、when B、while C、aft I know she ____ a book.It's popular now.A.writing B.wrote C. She had finished writing the letter when I went in. She was reading a novel when I came in.(改为否定句） She_______ __