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题型：单选题题类：常考题难易度：普通

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They ______ the road by the end of last month.

A、build B、was building C、had been building D、have been building

举一反三

The bus we {#blank#}1{#/blank#}(一直等待) was too crowded, so we decided to catch a later one.

He ______ research in the US for many years, but when he came back, he became a businessman.

She apologized to beg his forgiveness. After all, they _____ business for many years.

—I have failed in the driving test again. I ______ hard on it but …

—Never say die. In fact, the new rules are too difficult but you are making progress.

To my great relief, my old camera _____ before I had it repaired by an expert two years ago.

The crazy fans ________ patiently for two hours, and they would wait till the movie star arrived.

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