Question

【题目】David thought his radio was brokenhis sister pointed out he forgot to turn it on．
A.until
B.although
C.since
D.because

Answer 1

【答案】A
【解析】句意：David认为他的录音机坏掉了，直到他的姐姐提醒他忘记打开了。until直到……；although尽管；since自从；because因为。结合语境来分析逻辑关系，故选A。