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Mrs. Smith was very much impressed by ________.

A. what had seen in China　　　　　　　　   B. that she had seen in China

C. What she had seen in China　　　　　　 D. which had she seen in China

A. what had seen in China　　　　　　　　   B. that she had seen in China

C. What she had seen in China　　　　　　 D. which had she seen in China

Mrs. Smith was very much impressed by ________.

[　　]

A．what had seen in China

B．that she had seen in China

C．what she had seen in China

D．which had she seen in China