题目内容

___ otherwise directed by a doctor, this medicine should be taken three times a day.

A.Even if
B.Unless
C.Except that
D.As

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Passengers may leave bulky articles under the stairs ___ the conductor's permission.

A.at
B.with
C.on
D.in

His parents never intended ___ together with him though they hoped to see him off.

A.live
B.living
C.to have lived
D.to be living

You don't have to worry ___ we are here.

A.while
B.even if
C.though
D.until

The population of Pennsylvania increased from 50,000 in 1730 to more than 200,000 in 1763, ___ to the thousands of Scotch Irish.

A.in effect
B.in consequence
C.in large part
D.at large