单项选择题

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 time

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单项选择题

We talked about the things and persons（）we remembered in the school.

A.that
B.which
C.who
D.whom

单项选择题

Hearing the sad news，she （）her head in her hands and began to cry．

A.placed
B.hid
C.laid
D.buried