单项选择题

I suppose that he is serious, ______

A．do I
B．don't I
C．is he
D．isn't he
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单项选择题
Little ______ when I embarked on this quest(探求)where it would lead me.
A．have I know
B．had I know
C．do I known
D．did I know
单项选择题
You ______ take your tools in case some machines need repairing.
A．had better
B．would rather
C．would better
D．had rather
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