问题

With all my attention _______ my homework, I didn’t even notice my father standing by me.
A:to fix on
B:fixed on
C:fixing on
D:to be fixed on
B:fixed on
C:fixing on
D:to be fixed on
正确答案是:
同类题型
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Would you please tell me in today’s newspaper—Sorry, I haven’t read it yet.
he exam ______ in ten minutes, they were asked to hand in their mobile phones.