Ur answer should be C and D. Hope this helps.
<span>if these are the choices
A. This is his.
B. Whose is this?
C. Which one is this?
D. This hat is his.
then it is d</span>
The part of the question that gives us the most information is that we're looking for a contrast, or a way of comparison. So imagine you want to compare a big and a small elephant, you could say :
<span>although one is big, the other one is small
one is big which is good, conversely the other one is small which is also not bad
one is big, however, the other one is small
An elephant is big. in contrast that one is small
So we see that all four of them can be used to express contrast!
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<span>Well, this question is the tricky one! Actually, there wasn't left any marks, it is the main problem of this story. So in “Elegy Written in a Country Churchyard” by Thomas Gray, NO marks have the forefathers left on history? and according to this fact the only one correct answer is definitely the third option from the scale represented above - The forefathers have left no mark on history, having led “noiseless” lives.</span></span>