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1). Thousands including labourers, engineers and experts had have been working round the clock.2). Thousands including labourers, engineers and experts had been working round the clock.3). Thousands including labourers, engineers and experts had had been working round the clock.4). Thousands including labourers, engineers and experts having been working round the clock. |
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Answer» In the given SENTENCES, the noun used is the plural 'thousands', so the corresponding auxiliary VERB MUST be 'have been working' or 'had been working'. This is only given by option 2. Therefore, the correct answer is option 2. |
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