单项选择题

She is often seen ______ in the library on Saturday morning.

A. to read
B. was reading
C. reading
D. reads
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单项选择题
Sunlight can be used to ______ electricity.
A. producing
B. be producing
C. have produced
D. produce
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
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