问题
选择题
The singer _____ frustrated when she wasn't sure of thecorrect answer. [ ]
A. may be
B. used to
C. used to be
D. use to be
答案
答案：C
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The singer _____ frustrated when she wasn't sure of thecorrect answer. [ ]
A. may be
B. used to
C. used to be
D. use to be
答案：C