Multiple choice

When we entering Tokyo [a]/proper, we drove right [b]/through a tunnel that[c]/ opened into the Royal Gardens.[d]

  1. a

  2. b

  3. c

  4. d

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

The time clause requires the simple past tense, not the present participle. 'When we entering' should be 'When we entered'. After 'when', we need a finite verb (past tense) to show a completed action in the past.