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【单选题】
类风湿关节炎最可能的病因是A.
感染因子
B.
过敏反应
C.
受潮
D.
环境因素
E.
雌激素过多
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皮皮学刷刷变学霸
举一反三
【单选题】---–Sometime is knocking at the door. Who ______ it be? ----It ______ be Tom. He is still in the school.
A.
can; can't
B.
can; mustn't
C.
might; could
D.
might; may
【单选题】– There’s somebody at the door. Who ____ it be? Is it the postman? -- No. It ______ be him. It’s just seven o’clock. It’s too early.
A.
must, may not
B.
will, won’t
C.
may, mustn’t
D.
may, can’t
【单选题】–Someone is knocking at the door. Who ______ it be? --It ______ be Tom. He is still in the school.
A.
can; can’t
B.
can; mustn’t
C.
might; could
D.
might; may
【单选题】–Someone is knocking at the door. Who ______ it be? --It be Victor. He has gone to London yesterday.
A.
can; mustn’t
B.
can ; can’t
C.
will; must
D.
may; mightn’t
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