单项选择题

(Since) the injury (is bad), the doctors (will operate) him (immediately).

A. Since
B. is bad
C. will operate
D. immediately
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It () me as an uphill battle, simply because it is an awkward and time-consuming process.

A. appears
B. occurs
C. strikes
D. hits
单项选择题
The doctor will not perform the operation () it is absolutely necessary.

A. so
B. if
C. for
D. unless
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