1.

Which of phrases given below each sentence should replace the phrase quotation marks to make the grammatically correct? If the sentence is correct as it is, mark 'D' as the answer.Technology "must use to feed" the forces of change.

A. must be used to feed
B. must have been using to feed
C. must use having fed
D. must be using to feed
Answer» B. must have been using to feed


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