题目内容

Howhappyweare!Theholidaywehavebeenlookingforward_______at last

A. to hascome
B. tohavecome
C. tohavingcome
D. hascome

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Helookedaroundandcaughtaman_______handintothepocketofa passenger:

A. put
B. tobeputting
C. toput
D. putting

Whenyou arelearningtodrive,_______agoodteachermakesabig difference.

A. have
B. having
C. andhave
D. andhaving

Ifeltitagreathonor_______tospeaktoyou.

A. toask
B. asking
C. tobeasked
D. havingasked

MCS-51单片机与DAC0832的接口电路，常用的有直通方式、单缓冲方式和双缓冲方式。

A. 对
B. 错