৪৯. I have left the room but he (enter) the room.

Correct Answer: (C) has entered Tense consistency and the correct use of the Present Perfect tense is an important area in NTRCA English grammar. Why "has entered" is correct: — The sentence: "I have left the room but he has entered the room." — The first clause uses Present Perfect: "I have left" = I left recently and the result is current — To maintain tense consistency and convey a recently completed action, the second clause also needs Present Perfect — "has entered" = he recently entered the room (and is now inside) — Both clauses describe recent events with current relevance → Present Perfect is required Why other options are wrong: ✗ enters: Present Simple — used for habits or general truths, not a specific recent action ✗ entered: Simple Past — describes a past action with no connection to the present; inconsistent with "have left" ✗ is entering: Present Continuous — suggests the action is currently in progress (still entering); but the first clause is completed Present Perfect usage rule: — Used for: recently completed actions with present results — Structure: Subject + has/have + Past Participle (V3) — Trigger words: just, already, yet, recently, ever, never Source: Wren & Martin English Grammar; Murphy's English Grammar in Use; Past NTRCA Question Bank.