---Whywereyoulateforschoolthismorning，Tom？---Iwasaboutt...

問題詳情：

---Why were you late for school this morning，Tom？

---I was about to go to school _________ it began to rain．

A．since   B．while   C．as  D．when

【回答】

D

知識點：連詞

題型：選擇題