题目详情
单选题 Section ADirections: Complete each statement by choosing the appropriate answer from the 4 choices marked A, B, C and D. Mark the corresponding letter on the Answer Sheet with a single line through the center. (20 points)小题:We _______ make sure that the drinking water in this area is clean
A. needn't
B. ought
C. mustn't
D. must
学科:大学英语
时间:2025-06-14 21:51:14
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