单项选择题

My wallet is nowhere to be found. I ______ when I was on the bus.

A．must have dropped it
B．must drop it
C．should have dropped it
D．ought to have dropped it
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单项选择题
She believes in the principle ______ to love is to give, not to take.
A．how
B．which
C．that
D．what
单项选择题
Helen apologized for ______ to attend the party.
A．her not being able
B．her being not able
C．her to be not able
D．her not to be able
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