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【单选题】
单向琼脂扩散法的检测敏感度A.
不高，检测时间长达48-72h
B.
不高，检测时间仅需12h
C.
高，检测时间仅需2h
D.
高，检测时间仅需48～72h
E.
高，检测时间仅需12h
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【单选题】My father will come back home tomorrow. He has ________for nearly two weeks. [ ]
A.
gone on vacation
B.
been on vacation
C.
gone to vacation
D.
been to vacation
【单选题】My father _____ on business for two weeks. He'll return in 3 days. [ ]
A.
left
B.
has left
C.
has gone
D.
has been away
【单选题】Look! My father has ______. [ ]
A.
five baseballs
B.
six soccer balls
C.
seven basketballs
D.
two ping-pong balls
【单选题】My father went to Shanghai yesterday. He ______ back in two weeks. [ ]
A.
comes
B.
has come
C.
will come
D.
came
【单选题】My father has ______ for two weeks. I miss him so much.
A.
left
B.
leave
C.
gone
D.
been away
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