Finding food used ---- the biggest challenge for ancient people. They spent most of their time for it. A. to be B. to being C. being D. be - Grammar | English Grammar Quiz

Finding food used —- the biggest challenge for ancient people. They spent most of their time for it.

A. to be

B. to being

C. being

D. be

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Do Vs. Does Past Perfect Tense Adverb

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