1d) was designed (long time ago so past tense)
2d) Has been repaired (It is still going on the present, this year)
3c) Had discovered (He discovered America long time ago)
4a) To have worked (worked long ago when he was young)
Hope it helps!
Answer: the answer is D
Explanation:
I took the quiz and got it right
<span>You first have to
know the meaning of the word Subject which is in this case the one
which is asked. So, in a simple english sentence, a subject can be a
person, place, thing or an idea that is being discussed or studied.
It may do or be something which the verb allows us to find out. The
verb of a sentence must always be considered. It is the one which
expresses an action being done so in the sentence, “In the Elm Tree
cawed one large black crow”, we should look at the verb cawed which
is also in past tense. What is cawing? Therefore, the subject of this
sentence is the crow because it is the one who does the verb “cawed”. The answer to this question is letter C.</span>