— He hasn’t finished the work yet.
— Well, he .
A. ought
B. ought to
C. ought to have
D. ought to have finished
网友回答
@@A. [email protected]@B. ought [email protected]@(答案)C. ought to [email protected]@D. ought to have finished
解析：
to后不定式的动词be，have或have been通常不省略。