大全Section D-21

21.   Recent essays by Garrison Keillor, the humorist and host of the public radio show A Prairie Home Companion, describes what might happen if Huns, Goths, and Visigoths were to invade
    Chicago.

(A) describes what might happen if Huns, Goths, and Visigoths were to invade

(B) describes what would happen if Huns, Goths, and Visigoths invaded

(C) describes what would happen if Huns, Goths, and Visigoths would have invaded

(D) describe what might happen if Huns, Goths, and Visigoths were to invade（D）

(E) describe what happen if Huns, Goths, and Visigoths invade

我想问一下，D中不是有be to do的结构吗？这个怎么会对啊？所以我选了E...

请NN指教，谢谢~

D is correct, subjunctive...