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Select the most appropriate modal auxiliary to fill in the blank. He was so tired that he scarcely stand.

  • A.can
  • B.should
  • C.may
  • D.could

Answer: D

The blank takes "could": he was so tired that he could scarcely stand. The sentence is in the past, and "so tired that" begins a clause of result, so the modal must be the past form could. "Scarcely" already makes the meaning nearly negative, so no "not" is needed.

"Can" is a present form and does not agree with "was" in the first clause. "Should" would suggest advice or duty, and "may" would suggest permission or possibility in the present, so neither suits a past result.

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