168. How can he _____________ if he is not _____________?　他不听怎么能听到呢？ A. listen; hearing B. hear; listening C. be listening; heard D. be hearing; listened to

168. How can he _____________ if he is not _____________?　他不听怎么能听到呢？
A. listen; hearing B. hear; listening
C. be listening; heard D. be hearing; listened to

出自：东华大学大学英语4

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