I was told that although these old buildings _______ the Qing Dynasty, they remained in good condition.
#103620
A
are dated back to
B
dated back to
C
dating back to
D
have dated back to
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 A high-tech exhibition ________in the National Museum now. Let’s go and visit it.
#100890
A
will be held
B
is being held
C
was held
D
has been held
.If I _________too late last night, I could not have fallen asleep in class.
#103799
A
didn’t stay up
B
hadn’t stayed up
C
don’t stay up
D
haven’t stayed up
--When _________ the training course begin?--Next Monday.
#102922
A
has
B
is going to
C
does
D
did