题目内容：

40,41期
-is the haedmaster____at the present time?i'd like to go with him
-not until this afternoon
A available B suitable (A)
he left his hometown,___ never to come back again
A determined Bdetermine
C be determining Dto be determined (A)
unlikly,he was soon toldiscovered was unimportant yo them
A what why Bthat why C what that D why that (D)
Bthat why 与 D why that 区别