The teacher told us the fact _______.
正确答案： D
本题解析：
名词性从句中主句和从句中时态要保持一致。 但是在此句中， 后面讲述的是一个客观存在的事实规律，所以要选答案 D。
Opposition leaders will be watching carefully to see how the Prime Minister ________ the crisis.
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In the original test，all the animals in a test group are given a substance _______ half of them die
Nobody but you _______ what he said.
Some persons gain goal and direction from their tensions;others ________ under pressure.
That is the house _______ you can enjoy the scenery.
This type of desk and chair can be adjusted ________ the height of students at different ages