(Viên chức Mầm non) bài tập tiếng Anh theo chủ đề có đáp án - Test 2

We saw three houses, _______ had Been blown off in the storm.

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We saw three houses, _______ had Been blown off in the storm.

the roof of which

their roof

the roof of them

of which the roof

Giải thích

Đáp án đúng là a