The compositions contained so few errors that the teacher got the students _____ one another ’s papers.
A. correct
B. to correct
C. correcting
D. to be correcting
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有一台真空炉测漏前真空度5×10-3mmHg，3分后真空度2×10-2mmHg，求这台炉子的漏气率为多少Pa/min？能否进行重要用途TA15合金Φ622mm一次熔炼？
I never regretted _____ his offer, for it was not where my interest lay.
A. not to accept
B. not having accepted
C. having not accepted
D. not accepting
According to Maslow,self-actualization need excludes _______
A. personal development
B. self-discovery
C. satisfaction of inner desires
D. exploration and evaluation
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