问题

I don’t understand this question. I’d appreciate_____ if you could give me some help.[ ]
A: that
B: it
C: this
D: one
B: it
C: this
D: one
正确答案是:
同类题型
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ith Mr. Brown _______ us, we willsurely make more progress in our oral practice.
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___ he has finished writing the novel is unknown
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