if
as
unless
when
第1题：
A、is repaired
B、has been repaired
C、is being repaired
第2题：
Have you ever been to the place? You can see many places of interest there．（合并为一句）
Have you ever been to the place ________you can see many places of interest?
第3题：
A.at
B.to
C.up
D.for
第4题：
A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of a/an
A.turbocharger malfunction or failure
B.crankcase exhauster overload
C.overload on the intercooler
D.obstruction in the engine cylinders
第5题：
A.I am sorry.The parts have been ordered, but they haven't come in yet.
B.It was supposed to have been ready last week.
C.I will call you as soon as the repair is finished.
第6题：
Philip：I can’t believe I 2 you at last．And what have you been doing?
第7题：
A、should have been
B、ought to have been
C、must have been
D、can not have been
第8题：
A、needn’t have seen
B、must have seen
C、can't have seen
D、might have seen
第9题：
A.must be
B.has been built
C.must have been
D.could have been
第10题：