5.(4分)If the test taker finds an item to which an answer is not known, it may be ________ to leave it blank and go on with the test. A. valuable B. advisable C. considerable D. probable

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题目内容（兰州大学大学英语4）

5.(4分)If the test taker finds an item to which an answer is not known, it may be ________ to leave it blank and go on with the test.
A. valuable
B. advisable
C. considerable
D. probable

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