单项选择题

After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.

A．abortive
B．difficult
C．experimental
D．excellent
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单项选择题
No one really knows who composed this piece of music, but it has been ______ to Bach.
A．referred
B．attributed
C．identified
D．associated
单项选择题
The middle-aged woman has been ______ with a serious illness for half a year; she is dying now.
A．laid down
B．laid off
C．laid up
D．laid in
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