Specially trained dogs are being used to__________ the trapped mountain climbers in the Northwest.

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问题 Specially trained dogs are being used to__________ the trapped mountain climbers in the Northwest.

选项 A、watch over
B、keep track of
C、come up with
D、go in for

答案B

解析 受过特殊训练的狗正用于追踪在西北地区被围的登山者。本题是考查动词词组。watch over 意为“照顾,照看,保护”;keep track of意为“掌握……线索,情况,跟上……”;come up with 意为“赶上……,想出来(主意,办法等)”;go in for 意为“参加(考试或比赛);嗜好,爱好……”。
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