33. When a student asks_________it is wo
问题:
33. When a student asks_________it is worth staying up doing their lessons, a teacher may find it difficult to answer.
A.that
B.what
C.whether
D.How
33. When a student asks_________it is worth staying up doing their lessons, a teacher may find it difficult to answer.
A.that
B.what
C.whether
D.How