单项选择题

Please give her the book if you ______ her.

A. should see


B. will see
C. saw



D. were to
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单项选择题
The noise was caused by a wood-pecker ______ a tree in the garden.
A. peck
B. pecked
C. pecking
D. to peck
单项选择题
Plastic heart valves and other human spare parts have ______ possible many recent developments in surgery.
A. made it
B. been made
C. made

D. become
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