单选题As a sailor on duty you must know how to （）(调整)derricks.Ataken inBslack offCadjustDsend out
单选题
As a sailor on duty you must know how to （）(调整)derricks.
A
taken in
B
slack off
C
adjust
D
send out
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问答题Let the children learn what all educated persons must some day learn, how to measure their own understanding, how to know what they know or do not know.