mikemcgarry wrote:
ashish8814 wrote:
hi mike mcgarry..
i was confused btw option c & d. as it is obvious about time period. we are talking about people who smoked for at least 30 years. there is no confusion in sequence of events if we use simple past tense. plz clarify.
i was confused btw option c & d. as it is obvious about time period. we are talking about people who smoked for at least 30 years. there is no confusion in sequence of events if we use simple past tense. plz clarify.
smartguy595 wrote:
D. group: 53,000 current and former heavy smokers, aged 55 to 74, who had smoked for at least 30 pack‐years
to use past perfect tense we need two related events, one is earlier event in the past & the other later event
Please explain
...
