问题描述：
____ he is very good at numbers.
A.As he is a small boy B.A small boy he is
C.A small boy as he is D.Small boy as he is
为何不是A
A.As he is a small boy B.A small boy he is
C.A small boy as he is D.Small boy as he is
为何不是A
问题解答：
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