Up until that time,his interest had focused almost（ ）on fully mastering the skills and techniques of his craft.

单选题

Up until that time,his interest had focused almost（ ）on fully mastering the skills and techniques of his craft.

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单选题

This letter also provides procedures that can be used to help mitigate moisture ingress into the connector cavity until such time that the moisture problem can be resolved and a service bulletin is available to correct the problem.

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单选题

He said that he ------- with Mr. Black at that time.

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单选题

If at any time the officer in charge of the navigational watch is to be relieved when a manoeuvre or other action to avoid any hazard is taking place, ___.A. the relief of that officer shall be made prior to such action has been completedB. the relief of that officer shall never be madeC. the relief of that officer shall be deferred until such action has been completedD. the relief of that officer shall be made by the captain

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单选题

It was not until then that I came to know that knowledge _______ only from practice.

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