【单选题】The word "submarine" (Line 2,. Para. 3) is closest in meaning to "______".
A.careless
B.expensive
C.unsuspecting
D.hidden
【单选题】The word "submarine" (Line 2,. Para. 3) is closest in meaning to "______".
A.careless
B.expensive
C.unsuspecting
D.hidden
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