A.which
B.when
C.whose
D.what
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A.ahead or astern
B.fore or aft
C.up or down
D.speed or direction
A.manual mode
B.automatic mode
C.remote mode
D.follow-up mode
A.in addition to
B.in addition that
C.except that
D.except when
A.As long as
B.As far as
C.As well as
D.Unless
A.Late as it was
B.As it was late
C.Since it was late
D.Because of its late
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