题目内容

Steve has done his homework _______, but Kathy hasn't done hers _______.

[  ]

A. already, yet
B. already, already
C. yet, yet a
D. yet, already
答案:A
提示:

already和yet都有“还,直到现在还”之意,一般用于现在完成时态,already一般用于肯定句,yet一般用于否定句和疑问句;ever“曾经”;never“从来没有”。


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