Bộ ôn tập Từ cùng trường nghĩa môn Tiếng anh có đáp án (Part 2)
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She was insightful and _______, constantly surprising her parents by what she noticed. A. observant B. watchful C. vigilant D. cautious

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She was insightful and _______, constantly surprising her parents by what she noticed.

observant

watchful

vigilant

cautious

Giải thích

Chọn A