问题
选择题
Almost all tornadoes ______ in the US, in the area from Texas in the southeast to South Dakata in
the north.[ ]
A. are occurred
B. occur
C. occurred
D. are occurring
答案
答案：B
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Almost all tornadoes ______ in the US, in the area from Texas in the southeast to South Dakata in
the north.[ ]
A. are occurred
B. occur
C. occurred
D. are occurring
答案：B