单项选择题

The watch has disappeared; who ______ it

A. should have taken
B. could have taken
C. must have taken
D. would have taken
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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
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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