Rewrite the following sentence by removing the infinitive phrase: Teachers have found the overhead projector to be invaluable as a teaching aid. Teachers have found that the overhead projector __________.
A
To be invaluable as a teaching aid
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B
Is invaluable as a teaching aid
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C
Was invaluable as a teaching aid
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D
Invaluable as a teaching aid
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Solution
The correct option is D Is invaluable as a teaching aid Complex sentences have subordinate clauses which contain a verb, here "is". The tense in this case should be present. Hence, option B is correct. The rest of the options do not fit this description, hence, incorrect.