In the original test，all the animals in a test group are given a substance ______

In the original test，all the animals in a test group are given a substance _______ half of them die

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In the original test，all the animals in a test group are given a substance _______ half of them die

A、unless
B、until
C、lest
D、provided

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正确答案：

答案解析：

本题考查词义辨析。until：直到。符合句意，表示givenasubstance持续到halfofthemdie。

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