单项选择题

You don’’t know about the difficulty I had______ the work then at all.

A．done
B．to do
C．for doing
D．in doing
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单项选择题
(If) you (try to learn) too many things (at a time) you may get (confusing).
A．A
B．B
C．C
D．D
单项选择题
Of the two lectures, (the first) was by far (the best one), partly because the person who delivered (it) had (such) a pleasant voice.
A．A
B．B
C．C
D．D
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