题目内容
I have been busy writing an article these days. That's why I ______answer your letter until now (直到现在).
[ ]
A. haven't been able to B. could not
C. can not too D. was not able to
答案:A
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题目内容
I have been busy writing an article these days. That's why I ______answer your letter until now (直到现在).
[ ]
A. haven't been able to B. could not
C. can not too D. was not able to