题目内容

A．couldB．mayC．mustD．should

A. could
B. may
C. must
D. should

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A．infectionB．infectC．infectingD．infected

A. infection
B. infect
C. infecting
D. infected

A．forB．withC．toD．at

A. for
B. with
C. to
D. at

A．whoB．thatC．whoseD．in which

A. who
B. that
C. whose
D. in which

A．forwardB．aboutC．downD．away

A. forward
B. about
C. down
D. away