Normally a student must attend a certain number of courses in order to graduate, and each course which he attends and gives him

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问题    Normally a student must attend a certain number of courses
in order to graduate, and each course which he attends and gives him a       【M1】______
credit which he may count towards a degree. In many American universities
the total work for a degree consists of thirty-six courses each lasts for     【M2】______
one semester. A typical course consists of three classes per week for fifteen
weeks; while attend a university, a student will probably attend four or      【M3】______
five courses during each semester. Normally a student would expect to
take four years attending two semesters each year. It is possible to spread
the period of work for the degree over a long period. It is also possible      【M4】______
for a student to move between one university and another during his degree
course, though this is not in fact done for a regular practice.         【M5】______
    For every course that he follows a student is given a grade, which is
recorded, and the record is available for the student to show to prospective
employers. All this imposes a constant pressure and strain of work, and        【M6】______
in spite of this some students still find time for great activity in student
affairs. Elections to positions in student organizations arise much enthusiasm.      【M7】______
The efficient work of maintaining discipline is usually performed by students   【M8】______
who advise the academic authorities. Any student who is thought to
have broken the rules, for example, by cheating, have to appear before         【M9】______
a student court. With the enormous numbers of students, the operation
of the system does involve a certain number of activity. A student            【M10】______
who has held one of these positions of authority is much respected and
it will be of benefit to him later in his career.
【M2】

选项

答案lasts改成lasting

解析 句法错误,句子结构混乱。如果此处使用lasts,则此句在没有连词的情况下出现了两个谓语动词;显然,此处应当使用lasting,现在分词短语作定语修饰前面的courses。
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