問題詳情：
Has all that ____ without delay ____ yet?
A. can do…being done
B. done…been done
C. ought to be done…to do
D. should be done…been done
【回答】
D。that should be done without delay是定語從句。其中that在從句中作主語。而將本句還原後主句爲All has been done。
知識點：虛擬語氣與情態動詞
題型：選擇題
