Which of these sentences is grammatically perfect?
About this question
This question belongs to "Thì quá khứ hoàn thành tiếp diễn – Past Perfect Continuous" on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.
Question detail
Which of these sentences is grammatically perfect?
A
He has been working for two hours when I arrived.
B
He had been working for two hours when I arrived.
C
He were been working for two hours when I arrived.
D
He had worked for two hours when I was arriving.
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