Complete the sentence: The Hashemite University engineering department has three 3D printers, all of ______ are utilized for prosthetic manufacturing research.
Answer and explanation
Correct answer: D. which
- Step 1: Analyze clause structure: The sentence combines two clauses where the second is a non-restrictive relative clause of quantity ('all of ...').
- Step 2: Determine relative pronoun for non-human antecedents: 'printers' is an inanimate noun, requiring 'which' following a quantifier and preposition ('all of which').
- Step 3: Select 'which'.
Answer
which.
Why not the others: 'whom' refers only to persons; 'them' creates an ungrammatical comma splice without a coordinating conjunction; 'whose' denotes possession.
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