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题型：单选题题类：真题难易度：普通

At college, Barack Obama didn't know that he ______ the first black president of the United States of America.

A、was to become B、becomes C、is to become D、 became

举一反三

Our TV set sell well, but ten years ago no one could have imagined such a big share in the market that they______.

Tony has just arrived here, but I didn't know he until yesterday.

Now we can't do without the Internet. But no one could imagine the part it _____ in our daily life 20 years ago.

The CEO of the company said he would a{#blank#}1{#/blank#} effective methods to ensure food safety.

The students were told that they ________ at the school gate at 2: 00 this afternoon.

Our airconditioners sell well, but decades of years ago no one could have imagined such a big share in the market that they ________ .

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