When all those present(到场者)__ he began his lecture.A.sit B.s

When all those present(到场者)__ he began his lecture.A.sit B.s When all those present___he began his lecture.A.sit B.set C. all those present _______ he began his lecture. 英语时态：When all those present were seated he began his lecture When all those present___he began his lecture.(D) 关于seat的用法When all those present ______ he bagan his lecture. When all those present ___he begin his lecture. He devoted all his efforts __ children.A.to educating B.educ He began to play football __ he was six.A when A：__ __ does Ben __ ___ ___ B:It's his favorite.He does it e He __ all his money to buy a bike I liked to play football when I was young.__ A.So he was B.S