2. 外语
  3. We must be ______ our guard against this kind of disease.

We must be ______ our guard against this kind of disease.

admin2009-09-15  37
问题 We must be ______ our guard against this kind of disease.
选项 A、on
B、in
C、with
D、for
答案A
解析 be on one’s guard against是固定词组，意思是提高警惕。注意：be on guard，be on alert都指警惕，提防。
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