It’s two and a half weeks since the exchange students __________ Taixing.
A．a(chǎn)rrivedB．reached C．have been inD．have arrived in
B
It’s+段時(shí)間+ since引導(dǎo)的從句表示自從以來(lái)已經(jīng)多久了。Since引導(dǎo)的句子要用過去式，把C，D排除。
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