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【单选题】
实现体液免疫的血细胞主要是A.
中性粒细胞
B.
T淋巴细胞
C.
单核细胞
D.
B淋巴细胞
E.
嗜酸性粒细胞
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【单选题】It was last year _____ I visited the museum _____ you had visited.
A.
that; that
B.
when, where
C.
that; where
D.
when; that
【单选题】It is the place _____ I once visited when I was young.
A.
that
B.
in which
C.
where
D.
at which
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【单选题】— Have you ever visited the Opera House? —Yes．When I was in Sydney, I ______ it twice．
A.
have visited
B.
visited
C.
had visited
D.
would visit
【单选题】----- Have you ever visited the 2010 Shanghai World Expo? -----Yes．When I was in China , I ______ it twice．
A.
have visited
B.
visited
C.
had visited
D.
would visit
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【单选题】It is the place _____ I once visited when I was young.
A.
that
B.
in which
C.
where
D.
at which
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