4.
Reading the large book, he
knitted his brow
in concentration.
A、
pouted
B、
frowned
C、
winked
D、
grimaced
【正确答案】
B
【答案解析】
习语knit one's brow(皱眉),pout噘嘴,flown皱眉,wink眨眼,grimace做鬼脸
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