Question

    Preserve (A) down your smartphone at night wonrsquo;t

    help powering (B) the battery, since it's using (C) that you would be unlikely (D) the device at that time.
    A A-B and C-D Correct Answer Incorrect Answer
    B A-C and B-D Correct Answer Incorrect Answer
    C Only B-D Correct Answer Incorrect Answer
    D A-D and B-C Correct Answer Incorrect Answer
    E No exchange required Correct Answer Incorrect Answer

    Solution

    Here, A is incorrect at its place. Preserving down the smartphone wonrsquo;t make sense, but powering down a smartphone makes sense. Hence, A-B can be exchanged. Also, C and D are incorrect at their places. They can also be exchanged to get a meaningful sentence. Powering down your smartphone at night wonrsquo;t help preserve the battery, since it's unlikely that you would be using the device at that time.

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