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Ackroyd et al. (2020) ___ whether the use of facial recognition software is ethical. (suggests it is inaccurate)

A. points out

B. agrees

C. theorises

D. questions

We……. here since yesterday

A. has been

B. have been

C. were

D. have

This study _(suggests/suggest)_ a low-cost, bio-friendly way to decompose Styrofoam.
A. suggests
B. suggest

Helen has been a vegetarian _________three years.

A. for

B. since