21. A: He quit his job with no backup plan? B: Yeah, he really likes to __________.
(A) go out on a limb
(B) throw in the towel
(C) keep his nose to the grindstone
(D) get the show on the road
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統計: A(13), B(2), C(11), D(4), E(0) #3450037
統計: A(13), B(2), C(11), D(4), E(0) #3450037