[ Grammar ]
Change the sentence into passive voice
He had written three books before 1867.
A. Three books have been written before 1867.
B. Three books had written before 1867.
C. Three books had been written before 1867.
D. Three books were written before 1867.

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It is essential to quickly __________________ to emails so others can make decisions.
A. motivate
B. examine
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D. critique