[JLPT N2] I wonder how long…: 何年かかる＋[ことか・わけだ・ものか・ようだ]？
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[Practice Question]
あの建物が完成するのに、いったい何年かかる（＿＿）。
*あのたてものがかんせいするのに、いったいなんねんかかる（＿＿）。
1 ことか
2 わけだ
3 ものか
4 ようだ
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[Answer]
あの建物が完成するのに、いったい何年かかる（1 ことか）。
I wonder how many years it will take for that building to be completed.
〜ことか
= “I wonder how much / how many / how ~!”
It shows a strong feeling, such as surprise, frustration, or amazement.
It’s often used in this pattern:
【Question word】＋ことか
In this sentence, the question word is 「何年」(how many years).
So it connects naturally with 「ことか」.
いったい何年かかることか
= I wonder just how many years it will take…
This shows the speaker is amazed or frustrated, thinking:
“It takes way too much time!”
So, ことか is the correct answer.
✖ Other Choices:
わけだ
= “That’s why ~” / “No wonder ~”
ものか
= “No way ~!” / “I will never ~!”
ようだ
= “It seems ~” / “It looks like ~”
I hope this explanation helps! 😊