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问题

The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.

A:stood for
B:called for
C:paid for
D:contributed to
正确答案是:
同类题型

255 The college entrance examination isdrawing near and all the students are ploughing through their studies Whatdoes the underlined part means _____

thatshe has gone to the United States

I want to eat ________ apples. Are there ________ apples here

Hi, Mr. Zhao! ______ is coming. What would you like to buy for your Kid—Maybe a bike.

Which of the two subjects do you like, PE or music– . They are really interesting.

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