单项选择题

This missile is designed so tht once______nothing cn be done to retrieve it.firedB．beiThis

missile is designed so tht once______nothing cn be done to retrieve it.fired B．being fired C．they fired D．hving firedA．firedB．being firedC．they fireD．having fired

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单项选择题

The project is so designed tht once _______ nothing cn be done to chnge it．strtsB．hving st

rtThe project is so designed tht once _______ nothing cn be done to chnge it．strts B．hving strted C．strted D．strtingA．startsB．having startedC．starteD．starting

未知题型

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未知题型

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