Right now he _____ on a pair of jeans.
A. is trying
B. tries
C. has tried
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乳牙是婴幼儿重要的咀嚼器官,可以帮助消化,促进骨发育。()
A. 对
B. 错
宗臣就刘一丈来信中提到的“上下相孚,____”两语发挥而作《报刘一丈书》。
How much _____?
A. they do cost
B. do they cost
C. cost do they
幼儿的生长曲线保持平坦(停滞),一定有问题。()
A. 对
B. 错