单项选择题

（）he will be able to finish the task remains a question.

A、 Which
B、 As
C、 Whether
D、 What.

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单项选择题
He tried to join the army but was（）because of poor health.

A、 turned up
B、 turned down
C、 turned off
D、 turned in
单项选择题
The stars visible at night are immensely distant,（）is why they appear only very small points of light.

A、 it
B、 which
C、 that
D、 this
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