(Viên chức Mầm non) 5000+ câu trắc nghiệm Ngoại ngữ có đáp án - Test 2

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

51/65

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.