问题
was a clever boy, and ______ he was fourteen,he had learned advance mathematics by himself
A:accidents that affected many living things
B:air pollution
C:water pollution
D:from which
B:air pollution
C:water pollution
D:from which
正确答案是：
同类题型
Can you tell me whom the play ______ in 1997—Sorry, I don’t know.
It was very kind ________ the policeman ________ mehome.
What is it about him _____youdislike him .—-I don’t know . But I don’t likehim from the start .
___I saw him, his humor impressed me
The man didn’t know the thief broke into the house and stole all his valuable things.