单项选择题

It is reported that a lot of adults take lessons online （）further education.

A.after
B.to
C.with
D.for

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The teachers hope all of us can hand （）our homework（）time every day.

A.up；in
B.out；on
C.on；in
D.in；on

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It is（）good exhibition that I have seen it several times.

A.so
B.such
C.so a
D.such a