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______ it have been the failure to pick up directions from the ground control that caused the air crash?

A．Must

B．Could

C．Would

D．Should

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---How long _______ each other before they ________ married ?
-- -For about a year .

A．have they known ; get	B．did they know ; were going to get
C．do they know ; are going to get	D．had they known ; got

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---How long _______ each other before they ________ married ?
-- -For about a year .

A．have they known ; get	B．did they know ; were going to get
C．do they know ; are going to get	D．had they known ; got

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I really wonder ______ he has posted me many parcels _____ we worked together .

A．how ; after

B．why ; when

C．when ; before

D．why ; since

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It is a rule in his family that ______ comes home earlier should cook the dinner for the family .

A．anybody

B．who

C．who that

D．whoever

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The duties of a policeman are _____ than ____ .

A．dangerouser ; a teacher	B．more dangerous ; a teacher
C．greater danger ; those of a teacher	D．more dangerous ; those of a teacher

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