问题

We cannot figure out ______ quite a number of students were infected with the flu.
A:that
B:when
C:why
D:where
B:when
C:why
D:where
正确答案是:
同类题型
Would you like ________ apples— Yes, please.
en I was very young, I thought thatinside the radio ______ who liked talking very much.
.________ all over the hills and around the lake are wild flowers of different kinds.
Let’s keep to the point, or we______ any decisions
Everyone was silent as the organizer ________ the result of the speech competition.