104 câu trắc nghiệm Thì quá khứ hoàn thành (Past Perfect) có đáp án
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They ________ such majestic mountains before they visited Mont Blanc.

19/104

They ________ such majestic mountains before they visited Mont Blanc.

never seen

had never seen

never have seen

never saw

Giải thích

Chọn đáp án: B