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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.