They'd ________ all the arrangements for a huge party
A
Correct answer
Explanation
The sentence begins with 'They'd' which can be either 'They had' or 'They would'. Both require a past participle: 'They had made' (past perfect) or 'They would make' (conditional). 'Made' is the past participle of 'make'. Option B 'make' is the base form, incorrect here. Option C 'makes' is present tense. Option D 'making' is a present participle that doesn't fit this grammatical structure.