搜题
王老师:19139051760(拨打)
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第1题

Generally, snakes won’t attack humans________ they are threatened with danger.
A.if
B.since
C.unless
D.w
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第2题

If Peter ___________to the office tomorrow, tell him the news please.
A.come
B.comes
C.came
D.will come
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第3题

When Jack came in, I________ dinner with my parents.　　
A.was having
B.had
C. am having
D.have
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第4题

When Bill came in, I ____ with my friends.
A.will talk
B.talk
C.was talking
D.have talked
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