单项选择题

If you have trouble ______ the poems, the notes on the margins will help you.

A．to understand
B．understanding
C．for understanding
D．with understanding
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单项选择题
As we know, physics ______ the science of energy.
A．was
B．were
C．is
D．are
单项选择题
It was not until the accident happened ______.
A．when I became aware of my foolishness
B．when my foolishness became obvious
C．that did I realize my foolishness
D．that I became aware of my foolishness
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