No sooner had they gone to the plant than they (start) _____ to work.
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They fulfilled the task assigned by their teacher earlier than they (expect) ____.
He (take) ____ off his hat and bowed politely as he passed.
气管切开术后护理，最重要的是
A. 气管内滴药
B. 观察有无出血
C. 观察有无皮下气肿
D. 保证套管通畅
E. 伤口每日换药
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