I enquired of him __________________________________?

  • A. whether if he wants to join the course
  • B. if he did want to join the course
  • C. if he wants to join the course
  • D. if he wanted to join the course

Explanation

After a past reporting verb such as “enquired,” the usual sequence-of-tenses rule changes “want” to “wanted”: “I enquired ... if he wanted to join.” “Whether if” is redundant, and the other options do not follow the standard backshift expected here.

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