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英語順序対問題
次の問いにおいて,下の①~⑥の語句を並べ替えて空所を補い,最も適当な文を完成させよ。解答は( A ) ( B ) に入れるものの番号のみを答えよ。

Student: Ms. Hammond, what's the main cause of global warming?
Ms. Hammond: We don't know exactly, but the greenhouse effect    ( A )       ( B )    it.
【問題6】
選択肢
[1] with [2] be[3] is
[4] associated[5] to[6] thought

[1-2]  [1-3]  [1-4]  [1-5]  [1-6]
[2-1]  [2-3]  [2-4]  [2-5]  [2-6]
[3-1]  [3-2]  [3-4]  [3-5]  [3-6]
[4-1]  [4-2]  [4-3]  [4-5]  [4-6]
[5-1]  [5-2]  [5-3]  [5-4]  [5-6]
[6-1]  [6-2]  [6-3]  [6-4]  [6-5]