With the help of high technology, more and more new substances ___in the past few years.
#101737
A
discovered
B
have discovered
C
had been discovered
D
have been discovered
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—I wonder why you didn’t take part in the speech contest yesterday afternoon. —I'm terribly sorry, I________ myself.
#99343
A
am conducted
B
conducted
C
was conducting
D
would conduct
----- The opening ceremony has already started.------Look! The flag is _______ now.
#103241
A
risen
B
raising
C
being raised
D
being rose
Justin a book about his adventures in Tibet．I hope he can find a good publisher when it is finished．
#102865
A
was writing
B
is currently writing
C
has already written
D
wrote
---- The battery in my cell phone is running low. ---- I _____ that last night before we went to bed.
#101362
A
was noticing
B
have noticed
C
had noticed
D
would notice
The students busily when Miss Brown went to get the book she in the office.
#101482
A
were writing; left
B
wrote; had left
C
had written; left
D
were writing; had left