Question

It’s two and a half weeks since the exchange students __________ Taixing.

A．a(chǎn)rrived

B．reached

C．have been in

D．have arrived in

Answer 1

B

It’s+段時間+ since引導(dǎo)的從句表示自從以來已經(jīng)多久了。Since引導(dǎo)的句子要用過去式，把C，D排除。