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【单选题】

On the wall _____ two large portraits.

A.
hangs
B.
hang
C.
hanged
D.
hanging
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A.
need go
B.
must have gone
C.
should go
D.
can go
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A.
虽然二者是各自独立的过程，但它们是同时进行的
B.
物质的合成和分解过程，伴随着能量的储存、转移和释放
C.
先有物质循环，然后才有能量流动
D.
由于有了能量的流动，所以才有了物质循环
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A.
works
B.
worked
C.
has been working
D.
had been working
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A.
why you came late
B.
why did you come late
C.
when you came late
D.
when did you come late
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A.
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B.
蔬菜大棚
C.
西林郭勒草原
D.
西双版纳热带雨林
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A.
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B.
whether I had seen him before
C.
that I had seen him before
D.
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A.
how we have swiftly affected
B.
that how swiftly we have affected
C.
how swiftly we have affected
D.
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