【单选题】
Sam, having forgotten to save his work [] lost all of his revisions when his computer crashed.
①
comma
②
dash
③
brackets
④
semicolon
【单选题】
First please be ( ) during your travel，otherwise we will waste time.
①
on time
②
in time
③
at the time
④
by the time
【单选题】
Our civilization cannot be thought of as _____in a short period of time.
①
to have been created
②
to be created
③
having been created
④
being created
【单选题】
28. ____for a long time, the fields are all dried up.
①
There has been no rain
②
Having no rain
③
There having been no rain
④
There being no rain
【单选题】
Our civilization cannot be thought of as ____ in a short period of time.
①
to have been created
②
to be created
③
having been created
④
being created
【单选题】
It is a waste of time ____with such a silly fellow.
①
trying to reason
②
tried to reason
③
for trying to reason
④
to trying reasoning
【单选题】
By the time you get there, the guests will [填空].
①
have left
②
leave
③
left
④
be leaving