We must find ways to prevent the poisonous gases ________ polluting the air.
A: in
B: with
C: from
D: of
A: in
B: with
C: from
D: of
举一反三
- Ways must be found to prevent the poisonous gases ________ polluting the air. A: in B: on C: from D: at
- They took _______ measures to prevent poisonous gases from escaping.
- We must prevent them ___ making trouble A: on B: behind C: from D: for
- One of the ways to reduce the amount of greenhouse gases that we put into the air is to buy products that don't use as much energy.
- We must do everything possible to prevent such things from ________ again.