This river has changed its course many times. It _________ always located where it ________ at present.
#85380
A
isn’t; is
B
isn’t; will be
C
wasn’t; is
D
wasn’t; has been
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It was          back home after the experiment.
#85107
A
not until midnight did he go
B
until midnight that he didn’t go
C
not until midnight that he went
D
until midnight when he didn’t go
Whether you believe it or not, it is ______that causes your illness.
#84910
A
because of your overweight
B
you are so overweight
C
because you are overweight
D
your being overweight