Question

    Select the most appropriate option to fill in the blank.

    You must be on your guard ______ pickpockets, when you

    enter a crowded bus.
    A for Correct Answer Incorrect Answer
    B across Correct Answer Incorrect Answer
    C against Correct Answer Incorrect Answer
    D with Correct Answer Incorrect Answer

    Solution

    The phrase "be on your guard against" means to be watchful and prepared to defend yourself from something. In this case, the person is being advised to be careful of pickpockets.

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