Which interrogative pronoun should replace the blank space in the following sentence?: ___ happened?

1 Answer
Mar 7, 2018

color(red)("What")" happened?"

Explanation:

Of the interrogative pronouns:
color(white)("XXX")Who
color(white)("XXX")What
color(white)("XXX")Why
color(white)("XXX")When
color(white)("XXX")Where
color(white)("XXX")Which
color(white)("XXX")How
only What can be used without any additional word before "happened"