JohnLewis1980 wrote:
Recent cosmological advances have made it possible to observe stellar objects that would only a decade ago have been unable to be viewed.
A idem
B it possible to observe stellar objects that would have been invisible only a decade ago
C possible that one can observe stellar objects invisible only a decade ago
D possible the observing of stellar objects that were not capable of being viewed only a decade ago
E possible the observing of stellar objects that only a decade ago would not have been able to be viewed
please explain
Source: Princeton Review
oa es segunda letra
While I agree that it/they are two pronouns that one needs to be very careful with, there are exceptions
observing of?? Outright wrong. D & E out
possible that?? Also C does not show that they have not been visible until now.
So Now it is down to A & B.
It is raining now. Is the usage of it wrong? No. Similarly, the it here is benign.
We can let A go as it moves the invisible part away.
B is good as it moves the invisible part and also captures the part that these objects have been invisible for a decade with continuous tense.