—Hurryup.Thebusiscoming.—Oh,no.Wemustn’tcrossthestreet...

問題詳情：

 — Hurry up. The bus is coming.

— Oh, no. We mustn’t cross the street ________ the traffic light are green.

A. after          B. while       C. since    D. until

【回答】

D

知識點：連詞

題型：選擇題