A:when ; that
B:so; that
C:before; the
D:when; before4.
As a stopping point on the famous Silk Road, Loulan is believed __________ by sandstorms from AD 200 to AD 400.
下列结构中,与小肠的吸收功能无关的是( )
出下列动词的过去式。
①worry____ ②study____ ③ do____ ④ play____
⑤ visit____ ⑥climb____ ⑦ get____