has the children burdened with too much homework nowadays?A. It is who thatB. Who is it th

问题补充：

has the children burdened with too much homework nowadays?

A. It is who that

B. Who is it that

C. It was who that

D. Who was it that

答案：

A. It is who that

(答案→)B. Who is it that

C. It was who that

D. Who was it that

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