问题

Hey, you ________ at the computer all day. You should really take a break now.
A:have been sitting
B:were sitting
C:did sit
D:are sitting;
B:were sitting
C:did sit
D:are sitting;
正确答案是:
同类题型
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Could I ________a dictionary from you, David– Sorry, I _______ it to Mary yesterday.
Lastyear was a hard time to my friend Jim, but he didn’t_____ hope.