Some kinds of birds which were once a(n)______ sight are now becoming rare.
A)
cheery
B)
common
C)
often
D)
ordinary
出自：华北水利水电大学-水利水电工程-大学英语（3）
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Some kinds of birds which were once a(n)______ sight are now becoming rare.
A)
cheery
B)
common
C)
often
D)
ordinary
出自：华北水利水电大学-水利水电工程-大学英语（3）