Which verb tense is correctly used to describe completed simulations in a research context?

A. The researchers conduct thousands of simulations.

B. The researchers had conducted thousands of simulations.

C. The researchers were conducting thousands of simulations.

D. The researchers have conducted thousands of simulations.

答案解析

**Core Concept**: Grammar - Past Perfect Tense. **Analysis**: - Past perfect (B) is used for actions completed before another past action. Here, simulations were finished before drawing conclusions. - **Distractors**: - (A) Present tense mismatches past research contexts. - (C) Past continuous implies ongoing action, not completion. - (D) Present perfect links to the present, but the context is fully past. **Key Tip**: Past perfect emphasizes completion prior to another past event.

正确答案：B

Which verb tense is correctly used to describe completed simulations in a research context?

答案解析

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