From mother’s love, patience and understanding, I have learned what a huge responsibility

From mother’s love, patience and understanding, I have learned what a huge responsibility is to raise a child.
A. it
B. which
C. that
D. this

(答案→)A. itB. which C. thatD. this解析：考查指示代词。what a huge responsibility is to raise a child是what引导的宾语从句，作learned的宾语，宾语从句是一个感叹句的句式，正常句式应该是：it is a huge responsibility to raise a child。故选A。

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