一般过去时与过去进行时 — 英语词汇题
题目
Complete the sentences with the correct forms of the verbs in brackets. At 4:30 yesterday afternoon, Mia (1) ___ (look) for her notebook in the library when the lights suddenly (2) ___ (go) out. While she (3) ___ (use) her phone to find the door, a librarian (4) ___ (come) in with a flashlight.