She was insightful and , constantly surprising her supervisors by what she noticed.
Aimmortal
Bfragrant
Chabitual
Dobservant正確答案
答案與詳解
observant 意為「觀察敏銳的」,與 insightful(有洞察力)並列,並呼應後句 what she noticed,語意完美銜接。
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