By next week we shall ________ the course.

To completed

Have completed

Completing

Completed

Here next week indicates future.

This sentence belongs to Future Perfect Tense.

Have + third form of a verb is used in this tense.

By next week we shall have completed the course.

اگلے ہفتے تک ہم کورس مکمل کر لیں گے۔

agm.5.3.23