单项选择题

Not until I had read your letter （） the true state of affairs.

A、I understood
B、I did understand
C、did I understand
D、I understand

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单项选择题
I'm very busy （） for the exam now. Will you come again at some other time

A、to prepare
B、to be preparing
C、prepared
D、preparing
单项选择题
There is something wrong with the computer. You'd better have it （）.

A、repairing
B、be repaired
C、repaired
D、to be repaired
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