African proverb: Wisdom does not come overnight. The heart of the wise man lies quiet like limpid water. One who causes others misfortune also teaches them wisdom.
This is what I found when I googled your "question"
Sedimentary, metamorphic, magma
The correct answer is D, this is 'present perfect' tense. It is formed with the use of the verb HAVE in present simple tense (so, HAVE/HAS), and the past participle of a verb (or the third column of irregular verbs).
A cannot be correct, because then it would say - I hear.
B cannot be correct, because then it would say - I had heard.
C cannot be correct, because then it would say - I heard.
And since there is also HAVE HEARD, the correct answer has to be D.
C they think that sherlock could not serve the case till monday. I had this question a lot before