问题
选择题
It’s two and a half weeks since the exchange students __________ Taixing.
A．arrived
B．reached
C．have been in
D．have arrived in
答案
答案：B
It’s+段时间+ since引导的从句表示自从以来已经多久了。Since引导的句子要用过去式，把C，D排除。
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