单项选择题

The tree fell down()she had time to run away

A. as
B. after
C. before
D. until

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单项选择题
Look, here ()

A. Mr. Brown comes
B. comes he Mr. Brown
C. comes Mr. Brown
D. Mr. Brown has come
单项选择题
The storm sweeping over this area now is sure to cause () of vegetables in the coming days.

A. rarity
B. scarcity
C. invalidity
D. variety
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