单项选择题

Sunlight can be used to ______ electricity.

A. producing
B. be producing
C. have produced
D. produce
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单项选择题
My piano is magnificent, ______ since I was 18.
A. I got it
B. I’ve got it
C. I have it
D. I’ve had it
单项选择题
By the end of this month he ______ this painting.
A. will be finishing
B. will finish
C. is finishing
D. will have finished
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