It was with great joy _______ he worked out the problem that he had long been puzzled about.
| A．which | B．that | C．because | D．since |
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The student all the teachers were proud was accepted by Beijing University last year.
A．in  whom |
B．of whom | C．on whom | D．for whom |
It is surprising that little boy should have much knowledge of science.
| A．so, so | B．such a, such | C．so a, such | D．such a, so |
She is a warm-hearted person she spends a lot of time on volunteer work.
A. in order that B. in order to D. so that D. why
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