With more forests being destroyed, huge quantities of good earth ________ each year.
A. is washing away
B. is being washed away
C. are washing away
D. are being washed away
昨日习题解析：While watching television, ____________.
A. the doorbell rang
B. the doorbell tings
C. we heard the doorbell ring
D. we heard the doorbell rings
解析：watching television 的动作执行者是we，所以句子的主语应该是we . hear sb./sth. do sth.表示‘听......做了某事’，要用动词原形做宾补。
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