单项选择题

Yesterday I was caught in the rain, and had to look for the ______ of a tree.

A．shadow
B．shelter
C．bush
D．shade
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单项选择题
The teacher was busy ______ sums upon the blackboard. She was too busy ______ the students' questions.
A．to write out; answering
B．to write out; to answer
C．writing out; to answer
D．writing out; answering
单项选择题
Research has ______ that smoking causes lung cancer.
A．directed
B．indicated
C．judged
D．resulted
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