It was _____ it raised so many difficult questions _____ the book took a long time to come out.
| A．that; that | B．since; which | C．because; that | D．because; which |
—Next Monday is my birthday.
—Is that so? ________
| A．I can’t believe my ears. | B．I’m so glad to hear that. | C．What presents do you want? | D．Many happy returns of the day! |
On July 1st, 1921, the red boat on South Lake in Jiaxing ________ the birth of the Communist Party of China,
which marked a new start for Chinese people.
| A．witnessed | B．gave | C．experienced | D．founded |
Scientists have discovered amazing evidence showing how the human body rebuilds _______ while we sleep.
| A．us | B．ourselves | C．it | D．itself |
—Why didn’t you remind him of the possible danger?
—But what _______ otherwise? He never listens to me.
| A．could I do | B．could I have done | C．should I do | D．must I have done |
The new means of transport ________ in this city, so whether it will work out remains to be seen.
| A．have never tried | B．has never tried | C．have never been tried | D．has never been tried |