—Whatdoyouthinkofthepresenteconomicsituation?—Whenbigf...

問題詳情：

 — What do you think of the present economic situation?

— When big firms reduce their expenses, we ______ know that times are really hard.

A. shall    B. could

C. must    D. need

【回答】

A

知識點：情態動詞

題型：選擇題