题目内容
(请给出正确答案)
[单选题]
It is unusual () such a thing should happen in the 20th century.
A.that
B.which
C.who
D.of which
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A.that
B.which
C.who
D.of which
第1题
A、studies
B、is studying
C、studied
D、has studied
第4题
A、has skated
B、has been skating
C、both possible
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