Question

A paor of socks ___ been missing from my wardrobe.
a. has
b. have
c. were
d. is​

Answer 1

A pair of socks has been missing from my wardrobe. (Option A)

• A pair of an item is considered singular. Therefore, 'has' will be used for a pair of socks.
• The pair is still missing which means the action is still going on. It is an example of the present perfect continuous tense.
• As per the tense, a sentence is formed by using 'has been + root+ing'.
• Here 'has been' is used with singular, third-person pronouns.

Answer 2

a pair of socks have been missing from my wardrobe