TOEIC・English
Undergraduate

答えはDなのですが、B.C.Dは動詞でしょうか?分詞とかあれこれありますが、なぜDなのでしょうか?

No. 101 Customer reviews indicate that many modern mobile devices are often unnecessarily (A) complication (B) complicates (C) complicate (D) complicated

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