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