问题
选择题
I _____ carefully but could _____ nothing. [ ]
A. listened; hear
B. heard; listen
C. listened to; hear
D. hear; listen to
答案
答案：C
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I _____ carefully but could _____ nothing. [ ]
A. listened; hear
B. heard; listen
C. listened to; hear
D. hear; listen to
答案：C