Institution: SONALI BANK LTD Exam: Sonali Bank Ltd - Assistant Programmer - 26.08.2016 ||
Topic: Correction (Sentence Correction), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The question presents a sentence that discusses the difference between the current world and the world of the past decade. The phrase "we seen" is grammatically incorrect. The correct form should be "we have seen," which uses the perfect tense to indicate that the experience of seeing the world in the past influenced the present.

Let's evaluate the options:

A) "since we have seen" - While this option has grammatical merit, it does not fill in the sentence correctly. It would change the meaning and structure, creating a fragment instead of completing the thought.

B) "From what we have seen" - This phrase is grammatically correct and could work in context, but it still alters the original sentence's structure, making it less direct. It's not an exact substitute for the intended expression.

C) "from what we seen" - This option is incorrect due to the use of "seen" without "have," rendering it grammatically unsound.

Since none of the options fit perfectly while preserving the original structure and meaning of the sentence, the correct choice is D) None of these. A grammatically correct reconstruction could be: "Today's world is totally different from what we have seen in the last decade."