题目内容
His son has been late three times ________ the morning of last Thursday.
[ ]
A. in
B. on
C. since
D. until
答案:C
提示:
提示:
|
因为前面是现在完成时态,故后面只能用 since,意为“自上星期四上午以来”;如果用on的话,此句就是一般过去时态。 |
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