题目内容
Students and their teacher are ________ the Weather Observatory.
[
]|
A .at |
B .in |
|
C .of |
D .by |
答案:B
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Martin was once ________ “problem student”, but now he’s one of ________ top students.
| A.a, a | B.a, the |
| C.the, a | D.the ,an |