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题型：单选题题类：真题难易度：普通

Experience of this kind in both the U.S. and Europe well before the Second World War.

A、have conducted B、have been conducted C、had conducted D、had been conducted

举一反三

At present, many new workers ________ and in six months they will be sent to build a new railway.

The meeting {#blank#}1{#/blank#} (hold) in September, not nobody knows the date for sure.

No decision ____________about any future appointment until all the candidates have been interviewed.

—How did you get on in your final exam?

—I have no idea. The papers .

They are living with their parents for the moment because their own house {#blank#}1{#/blank#} (build).

It's {#blank#}1{#/blank#}(recommend) that students should concentrate on studies at school.

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