He acted as if he _ everything.
Correct answer: B. Had known
- A. Knows
- B. Had known
- C. Has known
- D. Knew
Explanation
The phrase 'acted as if' suggests a hypothetical or imaginary situation. In English, when referring to hypothetical past situations, we often use the past perfect tense. Therefore, 'had known' is the correct choice because it reflects a condition contrary to reality in the past. 'Knows' and 'has known' are incorrect because they imply present knowledge, not past hypothetical knowledge. 'Knew' is in the simple past tense, which does not emphasize the hypothetical nature as strongly as the past perfect tense.
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