The dog, ________, will be made a good watchdog．
A.to train properly
B.being trained properly
C.properly to train
D.trained properly
网友回答
D解析train的逻辑主语是the dog，和它构成动宾关系。A项表将来；B项表进行的被动；C项properly位置不对，且表将来；D项表被动，故选择此项。过去分词短语作条件状语，相当于if it is trained properly。watchdog看门狗。