500 Câu trắc nghiệm ngữ pháp Tiếng Anh có đáp án - Phần 15

She had worked as a tourist guide before __________ a teaching career

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She had worked as a tourist guide before __________ a teaching career.

starting

start

to start

started

Giải thích

Chọn đáp án A

before + Ving: trước khi làm gì