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定语从句专练
1. He has made another wonderful discovery, __________ of great importance to science.
A. which I think is B. which I think it is
C. of which I think it is D. I think which is
2. She is a girl __________ . She will never let you down.
A. you can believe B. you can believe in
C. you can have trust on D. whom you have believe
