題目列表(包括答案和解析)
The doctor will not perform the operation ___ it is absolutely necessary.
A. when B. if C. for D. unless
The doctor will not perform the operation ___ it is absolutely necessary.
A. when B. if C. for D. unless
The doctor will not perform the operation ___ it is absolutely necessary.
A. when B. if C. for D. unless
The doctor will not perform the operation ___ it is absolutely necessary.
A. when B. if C. for D. unless
The doctor will not perform the operation ___ it is absolutely necessary.
A. when B. if C. for D. unless
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