---Thatwomanhasbeentakingcareofthetwowhitetigersfor8ye...

問題詳情：

 ---That woman has been taking care of the two white tigers for 8 years.

---Oh, dear! She ______ a lot of difficulties!

A. could go through                       B. might go through   

C. ought to have gone through             D. must have gone through

【回答】

D must+完成時表示對過去事實的肯定推測。

知識點：虛擬語氣與情態動詞

題型：選擇題