Each of / neither of / one of + plural noun takes a singular verb

This type of question, asked 4 times: 20 Jul 2023 S1, 16 Sep 2025 S2, 19 Sep 2025 S2, 19 Sep 2025 S3. All 4 questions below, oldest first.

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Question 1
20 Jul 2023 S1
93 $The following sentence has been split into four segments. Identify the segment that contains a grammatical error. One of these / boxes have / the portrait / of the heiress.$
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Question 2
16 Sep 2025 S2
92 $Choose the most suitable option to replace the highlighted part of the sentence: Neither of the options *are suitable for this task. *$
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Question 3
19 Sep 2025 S2
85 $Find the part of the sentence that contains an error: Neither of the proposed strategies (1)/ seem to address the core issue (2)/ that the committee identified (3)/ during last month’s review. (4)/$
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Question 4
19 Sep 2025 S3
87 $Find the part of the sentence that contains an error: Each of the committee members (1)/ were obligated to disclose any potential conflict (2)/ regardless of how trivial it might appear (3)/ during the selection process. (4)$
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Question 1