单项选择题

I have no choice（）to put such remarks.

A.or
B.and
C.but
D.unless

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单项选择题I have altered course to 245 degrees for（）.

A.identify
B.identifier
C.identity
D.identification

I have（）you on my radar.A.seenB.sightedC.watchedD.locat...

单项选择题I have（）you on my radar.

A.seen
B.sighted
C.watched
D.located

How long must the GMDSS radio log be retained on board?...

单项选择题How long must the GMDSS radio log be retained on board?（）

A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry