It is said that a reliable treatment for the diseasewill be applied at least two or three months away and still it ______onanimals.

下列各句的句式，与其他三句不同的一句是（ ）

He used to inthe morning, but now he is used to atnight.

How can the problem be solved？—Well, we must __________ it to the president’s own judgment.

The air pollution in this area caused the of many trees.