单项选择题

查询职称为讲师的姓名,年龄和性别,正确的语句是? A.
db.teachers.aggregate([
{project:{"name":1,"age":1,"sex":1,"_id":0}}
])
B.
db.teachers.aggregate([
{project:{"name":1,"age":1,"sex":1}}
])
C.
db.teachers.find("prof":"讲师",{"name":1,"age":1,"sex":1}) D.
db.teachers.find({"prof":"讲师","name":1,"age":1,"sex":1})

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