问题

What were you doing____last Sunday morning
A:play
B:to play
C:plays
D:playing;
B:to play
C:plays
D:playing;
正确答案是:
同类题型
Excuse me, sir, ________ —I’d like a cup of coffee and two pieces of bread
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can’t leave the office now. A lot of work ________ to be done.
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