问题
选择题
Not until one of his works was published_________to gain his confidence in writing. [ ]
A. he was able
B. was he able
C. he had been able
D. had he been able
答案
答案：B
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Not until one of his works was published_________to gain his confidence in writing. [ ]
A. he was able
B. was he able
C. he had been able
D. had he been able
答案：B