Don't spend too much time _____ made in the previous test. It's a waste of time.

A. discussing with the pupils what errors were

B. on discussing with the pupils about errors

C. discussing the errors

D. to discuss about the errors

`→` Spend time/money (on) doing sth: dành thời gian/tiền bạc cho việc gì

$\text{@su}$

Don't spend too much time _____ made in the previous test. It's a waste of time.

A. discussing with the pupils what errors were

B. on discussing with the pupils about errors

C. discussing the errors

D. to discuss about the errors

Bonus: Cấu trúc spend time + doing sth : dành thời gian làm gì đó

               Eg: I spend time searching the project 

                    (Tôi dành thời gian để nghiên cứu bài dự án)

$\text{#BTS}$