It is compulsory for all the students to hand in t...

Câu hỏi: It is compulsory for all the students to hand in their assignments on time.

A. All the students needn’t hand in their assignments on time.

B. All the students can’t hand in their assignments on time.

C. All the students must hand in their assignments on time.

D. All the students may hand in their assignments on time.