.He is carrying______ to his dorm.A.the luggages B.a luggage C.the luggage
题目
.He is carrying______ to his dorm.A.the luggages B.a luggage C.the luggage
答案
C
He is carrying the luggage to his dorm.
他带着行李去他的宿舍.
luggage 是不可数名词
the 定冠词,特指
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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