单项选择题

Where is my pen I （）it.

A. might lose
B. would have lost
C. should have lost
D. must have lost

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The police found that George had still another （）of income

A. origin
B. source
C. basis
D. means
单项选择题
The doctor suggests that a person （） exercises every day if he wishes to be healthy.

A. does
B. did
C. do
D. will do
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