问题补充：
It is I singing in the garden.
A. who are
B. who is
C. that am
D. that is
答案：
A. who are
B. who is
C. that am
D. that is
解析：强调主语(指人)时,引导词可用that或who,谓语动词必须与所强调的主语保持人称和数的一致。
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