Multiple choice

Directions: Choose a suitable option to fill in the blank:

Huntington's disease is an acute neurological disease, usually___________ in the middle age.

  1. is beginning

  2. beginning

  3. which begins

  4. has begun
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The correct form is the present participle 'beginning' following the verb 'is' in a reduced relative clause structure. Huntington's disease typically begins showing symptoms in middle age. The full structure would be 'which is beginning' but the relative pronoun and auxiliary are omitted.

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