(Viên chức Mầm non) 5000+ câu trắc nghiệm Ngoại ngữ có đáp án - Test 1

We _____ tennis for half an hour when it started to rain.

35/60

We _____ tennis for half an hour when it started to rain.

was playing

has been playing

had been playing

would be playing

Giải thích

Đáp án đúng là c.