Nearly two weeks passed _________ I received my father’s letter.[ ]A. before

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Nearly two weeks passed _________ I received my father’s letter.[ ]
A. before
B. while
C. until
D. as soon as

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举一反三

His mother will tell him to do his homework _______ he gets home. [ ]
A. as early as
B. as quickly as
C. as soon as
D. as fast as

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He knew nothing about it _____ I told him.[ ]
A. since
B. because
C. until
D. after

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Xiao Li has worked here_____ he came here.   [     ]
A. when
B. before
C. since
D. while

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Peter likes reading a newspaper _____ he is having breakfast.  [     ]
A. until
B. while
C. because
D. though

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It is known to all that you exercise regularly, you won’t stay in good health.[ ]
A. unless
B. if
C. until
D. as

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