It was _______ that caused him to serve dinner an hour later than usual.
A. we being late
B. our being late
C. we were too late
D. because we were late
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It was how the young man had learned five foreign languages _______ attracted the audience's interest.
A. so that
B. that
C. what
D. in which
His uncle told him that it is _______ that he was brought up after his mother's death.
A. a retired old professor
B. from a retired old professor
C. with a retired old professor
D. by a retired old professor
You are quite wrong ---- she ______ like you.
A. will
B. does
C. would
D. has been
设R为列联表的行数，C为列联表的列数，则Χ2分布的自由度为（）
A. C
B. R*C
C. (R-1)(C-1)
D. R
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