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

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

出自：兰州大学大学英语（4）课程作业

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