We have a high regard for Mr. Black because he always tries to his principles.
A. live up to
B. look forward to
C. catch up with
D. put up with
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(答案→)A. live up to
B. look forward to
C. catch up with
D. put up with
解析：考察词组。Live up to实现，不辜负，做到 look forward to 期望 catch up with 赶上 put up with 忍受
句意为，我们很尊重布莱克先生，因为他总是遵循自己的原则