She advised that the work _at once Ais done B be done Cwas done Dwould be down
问题描述：
She advised that the work _at once Ais done B be done Cwas done Dwould be down
答
B.这是一个虚拟语气。
说全了应该是she advised that the work should be done at once.但是在美语中，should常常是省略的。所以就是B这个答案。这是高中重要的知识，请记住。
答
B