100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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 (why / you / clean) the bathroom before you bathed the dog?

95/100

 (why / you / clean) the bathroom before you bathed the dog?

Why had you cleaned

Why you had cleaned

Why cleaned you had

Why had you been cleaning

Giải thích

Chọn đáp án: A