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【单选题】

In such a fierce competition, a person has to make every effort if he_______.

A.
has succeeded
B.
would succeed
C.
will succeed
D.
is to succeed
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参考解析:
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举一反三

【单选题】Steven ________ since he got out of work three weeks ago.[ ]

A.
has been unemployed
B.
was unemployed
C.
had been unemployed
D.
has unemployed