单项选择题

-- I'd like to invite you to my birthday party this evening.
-- Thanks, but ______ I'll have time I'm not sure at the moment.

A．while
B．whether
C．if
D．when
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单项选择题
He spoke in a quiet, distant voice, as though his thought______
A．was far away
B．did far away
C．were far away
D．does far away
单项选择题
I, not you, ______ responsible for all this.
A．am
B．are
C．is
D．have
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