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