问题
选择题
—Can he work out the maths problem?
—I think ______ hard for him to work it out.[ ]
A. it's
B. that's
C. this is
D. they're
答案
答案：A
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—Can he work out the maths problem?
—I think ______ hard for him to work it out.[ ]
A. it's
B. that's
C. this is
D. they're
答案：A