The dog,_____,will be made a good watchdog.A.to train properly B.being trained properly C.properly to train D.trained properly解析是（ 过去分词短语作条件状语,相当于if it is trained properly.
问题描述：
The dog,_____,will be made a good watchdog.
A.to train properly B.being trained properly C.properly to train D.trained properly
解析是（ 过去分词短语作条件状语,相当于if it is trained properly.
答
这句话要表达的意思是
“如果狗被适当的训练了”即“if it is trained properly”,
trained properly在这里相当于“if it is trained properly”
过去分词短语有这样的用法 过去分词=if it is+ 过去分词