题目内容

A.whenB.becauseC.soD.but

A. when
B. because
C. so
D. but

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A.coveringB.lookC.colorD.cover

A. covering
B. look
C. color
D. cover

A.withB.inC.byD.of

A. with
B. in
C. by
D. of

A.neverB.alsoC.onceD.seldom

A. never
B. also
C. once
D. seldom

A.had toB.shouldC.mightD.must

A. had to
B. should
C. might
D. must

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