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9.They will have a maths test ___ two days?
A.for B.at C.in D.after
[答案] C.
[析] 三天之内应用in，而不要受中文影响用after， after three days 是个不定的时间范围，即没有一个准确的时间。5天、6天、10天全是after three days。
10.My brother joined the army ___
A.1989， March B.in March， 1989
C.March， 1989 D.1989， in March
[答案] B.
[析] 在月份、年、前用介词in，而日子前用on。
11.He couldn't work out the maths problem ___ your help?
A.without B.under C.for D.with
[答案] A.
[析] 在某人帮助下应用with， 如：With the help of the teacher I passed the exam easily? 而要是没有你的帮助则用 without your help?
12.Granny took one look at us ___ her glasses?
A.by B.through C.on D.in
[答案] B.
[析] through 为穿过……。
13.We had our breakfast ___ a quarter ___ seven?
A./， to B.in， to C.at， to D.on， to
[答案] C.
[析] 具体时间点前用at，而差几分几点用to，这里应译为：我在差一刻七点吃的早饭。
14.I learn French ___ the radio every day?
A.on B.in C.from D.at
[答案] A.
[析] 从收音机中听到某事应用词组 on the radio。
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