(Viên chức Mầm non) 5000+ câu trắc nghiệm Ngoại ngữ có đáp án - Test 1

Had I known his address, I _______ before.

34/55

Had I known his address, I _______ before.

Would write

have written

had written

would have written

Giải thích

Đáp án đúng là d.