Q1. Choose the most appropriate option to fill in the blank: Aditi has been working here __________.
A since six months
B six months ago
C six months before
D for six months Correct
Explanation
The sentence uses the present perfect continuous form, “has been working”, to describe an action that began in the past and continues now. A duration is expressed with “for”, so “for six months” is correct. “Since” is used with a starting point, such as “since January”, not with a length of time like six months. “Six months ago” places an event at a past time and does not fit the continuing action. “Six months before” needs another past reference point, which the sentence does not provide.