[ Grammar ]
noun-verb agreement
The machinery used to build roads ____ very expensive.
_____
A. are
B. is

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IELTS GrammarSubordinating ConjunctionsWh QuestionsGerund, Participle, Infinitive, or AppositiveIF CLAUSEUncountable NounsFirst and Second ConditionalPresent Simple QuestionsModal Verbs & Perfect InfinitiveHelpful PhrasesOther quiz:
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My mother is a ____ . She fixes teeth.
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