问题
Nowadays, the iron and steel industry ________ the key link in socialist production.[ ]
A: is
B: are
C: was
D: were
B: are
C: was
D: were
正确答案是：
同类题型
The clock ________ eight when I woke up.[ ]
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10, 2013, Ma Yun resigned as CEO of Alibaba, and Lu Zhaoxi it over.
Your composition is well written, ____ some spelling mistakes[ ]