Unit 9
问题描述：
Unit 9
I ________ (not hear) from my pen pal for two monthes.
答
I haven't heard from my pen pal for two months.从for two months,知道这道题应该用现在完成时,而现在完成时的格式是have+动词分词,再加上这一题有单词not,所以应该在have后面加上not,所以合起来这道题就得填haven't heard