A.I'm not satisfied with your explanation of where you <u>were</u> last night.
b.I came into the room when Mary <u>was playing</u> the piano.
c.no error!!!
d.There <u>are</u> some sheep in the field.
e.Playing the drums and singing<u> is </u>difficult.
Answer:
C.
Explanation:
Opportunity cost is the forgone benefit that would have been derived from an option not chosen. In this case, the lost is the potential profit they might make, which is C.
Answer:
Humans have to sleep and robots don’t
Explanation:
Answer:
D i think so (evaluating the text before and while reading it)
