Mother told Jim to watch the milk until it boiled and then off the gas. A. turnB. turning

发布时间：2020-08-16 14:45:56

Mother told Jim to watch the milk until it boiled and then      off the gas.
A. turn
B. turning
C. turned
D. having turned

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(答案→)A. turn
B. turning
C. turned
D. having turned
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