单项选择题

There are ______ morphemes in the word "undesirability".

A．three
B．four
C．five
D．six
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单项选择题
—I m sorry I didn t make it to your party last night.—______. I know you re busy these days.
A．Of course
B．No kidding
C．That"s all right
D．Don"t mention it
单项选择题
______ the rain stop, the sun flower would be saved.
A．Can
B．Must
C．Should
D．Will
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