提问是每周,所以是频率,那么就是B
A是问时间和长度,C是几点,D是问多少次,因为不确定次数,最好选B
2. 固定搭配,选C
take sb some time to do sth 某事花某人多长时间
sb spend some time on (doing) sth 某人在某事上花多久时间
3. 他是全班最高的,也就是他比其他学生都高
He is taller than the other students in his class.
原句错了,少了个the, 应该是He is the tallest student in his class