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【单选题】
Mark was a student at this university from 1999 to 2003, _______ , he studied very hard and was made Chairman of the Students' Union. A. during which time B. for which time C. during whose time D. by that timeA.
during which time
B.
for which time
C.
during whose time
D.
by that time
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反馈参考答案：
举一反三
【单选题】关于纤维素的结构,下列哪项是正确的:
A.
有α-1，4糖苷键
B.
有α-1，6糖苷键
C.
有β-1,4糖苷键
D.
纤维素中的单糖都是α-D葡萄糖
E.
纤维素的长链卷曲成螺旋状
参考解析：
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