—It's very dangerous to swim in the pool. Look at the sign.
—Oh,I _____ notice it. Thanks for telling me.
动词时态辨析。
根据本题语境可知,“我之前没有注意到标语”,需要用一般过去时,故选D。
_____ your help,I can't get good grades.
介词的用法。
句意为:没有你的帮助。我无法取得好成绩。表示“没有、无”要用介词without,故答案为B。
He hasn't communicated(沟通) much with his parents since he _____ a mobile phone last year.
动词时态辨析。
自从去年他得到手机之后,他和他父母的沟通就不多了。
根据题中last year可知,得到手机是发生在去年的事情,用一般过去时,故选A。