单项选择题

Tom didn' t pass the maths exam ______ his carelessness.

A. because
B. since
C. as
D. because of
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单项选择题
Her mother was ill. We should ______ a doctor
A. send away
B. send for
C. send off
D. send out
单项选择题
We took badly ______ man to the hospital.
A. ill
B. sick
C. illness
D. A and B
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