A that-clause as subject takes a singular verb

This type of question, asked 2 times: 12 Sep 2025 S1, 13 Sep 2025 S2. All 2 questions below, oldest first.

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Question 1
12 Sep 2025 S1
85 $Find the part of the sentence that contains an error: That the report failed to address the root causes (1)/ of the community unrest were surprising (2)/ given the exhaustive data (3)/ compiled over several months. (4)$
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Question 2
13 Sep 2025 S2
86 $Find the part of the sentence that contains an error: That there exists no recourse for citizens (1)/ if environmental violations are condoned at the ministerial level (2)/ underline a systemic erosion of (3)/ constitutional accountability. (4)$
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Question 1