Multiple choice

Fill in the blank.

The safe showed no signs of _______ been touched.

  1. have

  2. having

  3. has

  4. all of the above

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

After the preposition 'of,' the verb must be in the gerund form (-ing). 'Having' is the gerund of 'have.' 'Having been touched' forms the perfect passive gerund, describing an action (or lack thereof) that occurred before the statement. 'Have' and 'has' are finite verb forms and cannot follow prepositions.

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