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【单选题】

Nowadays,the iron and steel industry _____ the key linkin socialist production.
[ ]

A.
is
B.
are
C.
was
D.
were
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参考答案:
参考解析:
.
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举一反三

【单选题】That's the hotel___last year.[ ]

A.
which we stayed
B.
at that we stayed
C.
where we stayed at
D.
where we stayed