题目内容

_______ he had not hurt his leg, John would have won the race.

A. If
B. Since
C. Though
D. When

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Small sailboats can easily turn over in the water ______ they are not managed carefully.

A. though
B. before
C. until
D. if

The field research will take Joan and Paul about five months; it will be a long time _____ we meet them again.

A. after
B. before
C. since
D. when

Leave your key with a neighbor ___ you lock yourself out one day.

A. ever since
B. even if
C. soon after
D. in case

You will be successful in the interview you have confidence.

A. before
B. once
C. until
D. though

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