57. Privacy advocates are troubled by the array of video cameras, motion detectors and other sensors ______ the shopping aisles.
(A) monitor
(B) monitoring
(C) monitored
(D) to monitor

答案：登入後查看
統計： A(49), B(391), C(49), D(33), E(0) #79684

詳解 (共 2 筆)

#680929
分詞構句，刪除連接詞，將從屬子句動詞改成Ving或Ved
2
0
#645005
查了每個單字 還是看不懂
0
0