I'm a bit confused with the proper use of the past perfect tens. Take this question (from veritas prep) for example:
In an interview last month, the rebels estimated that a few hundred of their fightershad been trained over the past two years, and they received close to two million dollars worth of ammunition, guns, and heavy artillery during the same time period.
A) had been trained over the past two years, and they
B) were trained over the past two years, and they had
C) were trained over
...
In an interview last month, the rebels estimated that a few hundred of their fightershad been trained over the past two years, and they received close to two million dollars worth of ammunition, guns, and heavy artillery during the same time period.
A) had been trained over the past two years, and they
B) were trained over the past two years, and they had
C) were trained over
...
