100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án
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They ________ (cycle) all afternoon so their legs were sore in the evening.

28/100

They ________ (cycle) all afternoon so their legs were sore in the evening.

had been cycle

had been cycling

had cycled

had been cycled

Giải thích

Chọn đáp án: B