题干
How could he get the plan _____ without any one to support him?
A：to carry out
B：carry out
C：carrying out
D：carried out
答案(点此获取答案解析）
D
A：to carry out
B：carry out
C：carrying out
D：carried out
和 
的混合溶液进行了如图实验，已知溶液甲呈蓝色.