Question

You will not be allowed to get into the plane_______ you pass security checks(安检).

A．if

B．unless

C．or

D．because

Answer 1

B

试题分析：句意：如果你不通过安检，你将不被允许上飞机。A if 如果 B. unless 如果不C. or 否则 D. because因为，根据句意，故选B。