单项选择题

My little son has not learned how to（）the time yet.

A. see
B. know
C. understand
D. tell

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单项选择题
Although he lives alone in the countryside, he doesn't feel（）

A. alone
B. on his own
C. himself
D. lonely
单项选择题
The star has been playing basketball（）he was a boy.

A. during
B. when
C. since
D. as
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