单项选择题

You will not be able to succeed ______ you work harder than you do now.

A. in case
B. in only
C. provided
D. unless
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It was terrible, one passenger was killed, and the other was ______ injured.
A. completely
B. hardly
C. severely
D. unusually
单项选择题
You should hire a more ______ manager than the one you currently have.
A. sufficient
B. effective
C. efficient
D. respective
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