By the year 2030, they _____ (invent) a device for doing homework. A. will have invented B. will be inventing C. will invent D. are going to invent - Tenses | English Grammar Quiz

By the year 2030, they _____ (invent) a device for doing homework.

A. will have invented

B. will be inventing

C. will invent

D. are going to invent

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