问题
选择题
It will be at least three weeks________ he recovers from his illness and returns to work.
A．before
B．when
C．since
D．after
答案
答案：A
考查固定句型。It be 一段时间before从句，意为：一段时间以后某事才发生。句意：至少3个星期以后他才从疾病中恢复重新回到工作岗位上。
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