Hung will have finished his project on sustainable development______.
when he came back
after he had come back
as soon as he had come back
by the time he comes back
Correct Answer: EASY
Knowledge: Adverb clauses of time
Because the main clause is future tense, the adverb clause of time is in the present tense => type A, B, C
Formula: By the time S + V(s/es), S + will have Ved/V3.
Hung will finish the project on sustainable development in the coming time.