单项选择题

My pain ______ apparent the moment I walked into the room, for the first man I met asked sympathetically: “Are you feeling all right”

A．must be
B．must have been
C．had been
D．had to be
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单项选择题
Jean Wagner’s most enduring contribution to the study of Afro American poetry is his insistence that it ______ in a religious, as well as worldly, frame of reference.
A．is to be analysed
B．has been analysed
C．be analysed
D．should have been analysed
单项选择题
______ there is little we can do to modify the weather; we can at least know what kind of weather to expect.
A．Since
B．When
C．While
D．Unless
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