Until his last class at the university in 1978,Bob always turns in all of his assighments on time.

A A

B B

C C

D D

Correct Answer: Option B

turns এর স্থলে turned হবে । কারণ ,স্পষ্ট অতীতকাল ১৯৭৮ উল্লেখ আছে বিধায় past indefinite হবে ।