【题目】He is ____ a letter.（ ）
A. writeB. writesC. writingD. writeing
【答案】C
【解析】
他正在写信．考查动词的现在分词．根据前面有is，后面要用动词的现在分词构成进行时，故用write的现在分词writing．故选：C．
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