Question

developed countries have been asked to alter their lifestyles. The shift in energy source (a) be backed by subsidies to (b) who produce clean energy and the countries (c) to look at the use of biofuels.

A)would, should, might, can
B)once, one's, those, these
C)need, ought, have, had

help me with the third one

Answer 1

Have ... i think so it is the answer