单项选择题

Fibers of hair and wool are not continuous and must normally be spun into thread ______ woven into textile fabrics.

A．as are they
B．when to be
C．that they are
D．if they are to be
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单项选择题
It was difficult to ______ a date which was convenient for everyone.
A．decide
B．arrange
C．organize
D．provide
单项选择题
He found Irene ______ at the piano with her hands on the keys.
A．seating
B．seated
C．seat
D．to seat
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