We must be ______ our guard against this kind of disease.A、onB、inC、withD、for

游客2025-07-30 1

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。

转载请注明原文地址:https://www.tihaiku.com/zcyy/4182512.html

相关试题推荐

随机试题

最新回复(0)

【B1】[br]【B6】A、ofB、againstC、forD、withC“foroneself”是“独立地”的意思。