100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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Bruno and Marcela met at a medical assembly, which Marcela ________ for a long time.

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Bruno and Marcela met at a medical assembly, which Marcela ________ for a long time.

was attending

has been attending

have been attending

had been attending

Giải thích

Chọn đáp án: D