Question

Fill most appropriate words in the blank.
I Felt someone ------- me on the shoulder but when I turned around, there was no one there.
A. Tapping
B. To tap
C. Tapped
D. tap

Answer 1

Hint: A verb is used to express an occurrence, action, or state. It is the grammatical center of the predicate in a sentence. An auxiliary verb is a verb which is used in the formation of tenses, moods, tones, etc.

Complete answer:
Tap ​definition​‌‌ (Verb) -- touch gently, listen to phone calls, get substance, get benefit from, choose for task.
Phrasal verb -- INTRANSITIVE/TRANSITIVE – (A) to touch someone or something gently and to move them slightly, or to make a soft knocking sound.
EXAMPLE – 1- Michael tapped his nose with his forefinger.
2-He tapped another code into the computer.
3-Several young men sat tapping away at keyboards (=using computers).
Tap at/on/against: 1-We could hear someone tapping at the door.
Tap someone on something: I tapped him on the shoulder and he jumped.
(B) To touch the screen of a mobile device in order to make something happen
 EXAMPLE-
 If you have decided to attend a programme, tap this button to add and synchronise the event detail.
Tap here to activate the plugin.
Hece Option A is correct as felt indicates the use of tapping.
The other options are wrong as no other tense can be used here.

Hence, the correct answer is option ‘A’.

Note: Synonyms and related words -- To touch, or to pick up someone or something, touch, pick up, Handle.