单项选择题

He ________ have been nervous because he didn't go straight in.

A．ought to
B．must
C．should
D．had to
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单项选择题
Despite the wide range of reading material specially written or ________ for language learning purposes, there is yet no comprehensive systematic program for the reading skills.
A．appointed
B．assembled
C．acknowledged
D．adapted
单项选择题
Before the tourists set off, they spent much time setting a limit ________ the expenses of the trip.
A．for
B．in
C．to
D．about
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