I didn"t come to the party yesterday evening ______ I had to look after my mothe

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I didn"t come to the party yesterday evening ______ I had to look after my mother at home. [     ]
A. when
B. why
C. because
D. if

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举一反三

He wants to be an actor        it"s an exciting job.[     ]
A. and
B. so
C. because
D. why

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We won"t go back home _____ we find the owner of the handbag. [     ]
A. because
B. after
C. when
D. until

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I have only ten yuan with me, _____I can"t buy the expensive dictionary.[     ]
A. thought
B. but
C. so
D. because

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He asked me _____ he could go to visit some museums during the trip.[ ]
A. when
B. if
C. what
D. where

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They won"t leave _____ he comes back. [ ]
A. when
B. while
C. until
D. because

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