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
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单项选择题
We are fortunate ______ several descriptive papers have been published which give adequate background and experimental results.
A．in which
B．so that
C．as if
D．in that
单项选择题
It was decided to ______ the match because of the rain.
A．call on
B．call out
C．call in
D．call off
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