问题
单项选择题
How can he（）if he is not（）?
A.listen; hearing
B.hear; listening
C.be listening; heard
D.be hearing; listened to
答案
参考答案：B
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How can he（）if he is not（）?
A.listen; hearing
B.hear; listening
C.be listening; heard
D.be hearing; listened to
参考答案：B