Among the things Google \_\_\_\_ to Play, its new online store, were the mobile apps formerly housed in its Android market.
Aadding
Badded正確答案
Cis added
Dto add
答案與詳解
為什麼答案是 B
added 為過去式主動動詞。此處為省略相對代名詞的形容詞子句，主詞 Google 需接過去式動詞，且與主句過去時態（were, formerly）呼應。
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