which??
3D printing is quickly becoming a big industry in the technology world. Most 3D printers use an additive process ___________ objects are printed out by a machine that places layers upon layers of material down in a 3D shape.

In the blank, I filled in 'which', the correct answer is ' during which' ,why is my answer wrong??

Question

which??
3D printing is quickly becoming a big industry in the technology world. Most 3D printers use an additive process ___________ objects are printed out by a machine that places layers upon layers of material down in a 3D shape.

In the blank, I filled in 'which', the correct answer is ' during which' ,why is my answer wrong??

Answer

Objects are printed out while the additive process is occurring / taking place. Therefore the answer is 'during which'.

Answer

Most 3D printers use an additive process. DURING THAT PROCESS, objects are printed out by a machine that places layers upon layers of material down in a 3D shape.
So the answer should be "During which".
Another example:
"This is my friend. I wrote a letter to her" ===> "This is my friend TO WHOM I wrote a letter" or "This is my friend WHOM I wrote a letter TO"

P/s: I am sorry if my answer is not so clear to understand. Feel free to ask ;)

Answers · 2

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