We are said ( ) in the Digital Age.
A. living
B. lived
C. to have lived
D. to be living
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They discovered that some young plants make a clicking sound in their roots, which is so quiet that human are ____________ (able) to hear it.
Mary was so tired that she was ______________ (able) to go any further.
What are your plans for the ____________ (develop) of your company?
They were doing ______________ (exact) the opposite to what I had told them.