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【单选题】

So far this year we ______ a fall in house prices by between 5 percent and 10 percent.

A.
saw
B.
see
C.
had seen
D.
have seen
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参考解析:
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举一反三

【单选题】____of danger in the street at night, she had to go home, with a friend ___ her.

A.
Warned; accompanied
B.
Warning; accompanying
C.
Having warned; accompanied
D.
Having been warned; accompanying