Select the most appropriate option to fill in the blank.

He ______ his portrait in the main hall.

hung

The most appropriate option to fill in the blank is hung.

The sentence is in the past tense, and the verb "hang" can be used in the past tense in two ways: hung and hanged. The past tense form hung is used when the object is not dead, while the past tense form hanged is used when the object is dead. In this case, the object of the verb is a portrait, which is not dead, so the correct past tense form is hung.

The other options are not as appropriate.

• Had hanged is the past perfect tense of the verb "hang", which is used to describe something that happened before another event in the past. In this case, there is no other event in the past that the hanging of the portrait happened before, so the past perfect tense is not appropriate.
• Hang is the present tense form of the verb "hang", which is not appropriate in this context because the sentence is in the past tense.
• Hanged is the past tense form of the verb "hang" when the object is dead, which is not the case in this sentence.