Difficulty: Easy
Correct Answer: We are trying
Explanation:
Introduction / Context:The sentence tests correct tense for an action that began in the past and continues up to the present. English requires the present perfect continuous for such duration-marked activities.
Given Data / Assumptions:
Concept / Approach:Use “have/has been + -ing” for actions that started earlier and continue now: “We have been trying … for the past two years.” Present continuous (“are trying”) describes “right now,” not an action sustained across two years, so it clashes with the duration phrase.
Step-by-Step Solution:
Identify duration phrase → signals present perfect continuous.Change “are trying” → “have been trying”.Correct sentence: “We have been trying to locate the historical city for the past two years.”Verification / Alternative check:Try removing the duration: “We are trying to locate …” becomes fine. The error emerges only because “for the past two years” demands “have been trying”.
Why Other Options Are Wrong:
Common Pitfalls:Using present continuous with “for/since + time period”; forgetting the perfect aspect for continuing states and actions.
Final Answer:We are trying
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