单项选择题

A laser beam is used to （）even the hardest substance.

A. light up
B. repair
C. identify
D. penetrate

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单项选择题
The composers soon began to write musical dramas（）about Bible stories in church.

A. to perform
B. performing
C. to be performed
D. be performed
单项选择题
It is probably both that he is going to the meeting on time（）by the morning traffic jam.

A. and that he might be delayed
B. or that he might be delayed
C. and he might be delayed
D. otherwise that he might be delayed
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