The river smells terrible. People must ________ dirty things into it.

A. be stopped to throw

B. be stopped from throwing

C. stop to throw

D. stop from throwing

The river smells terrible. People must ________ dirty things into it.

A. be stopped to throw

B. be stopped from throwing

C. stop to throw

D. stop from throwing

The river smells terrible. People must ________ dirty things into it.

[　　]

The river smells terrible. People must ________ dirty things into it.

[　　]

 The river smells terrible. People_______ dirty things into it .

  A. must stop to throw           B. must stop from throwing  

C. must be stopped to throw      D. must be stopped from throwing