No sooner ______ started to shine ______ it was clouded over again.
| A．the sun had; than | B．had the sun; than | C．had the sun; when | D．the sun had; when |
China is a peace-loving country and _____no circumstances _____ first use nuclear weapons.
| A．on; will China | B．on; China will |
| C．under; will China | D．under; China will |
In the past decades, sea ice _____in the Arctic as a result of global warming.
| A．had melted | B．has been melting | C．melted | D．is melting |
In our country the cold weather in the north_____ sharply _____the hot weather in the south.
| A．combines；with | B．relates；to | C．compares；with | D．contrasts；with |
_____of danger in the street at night, she had to go home, with a friend_____ her.
| A．Warned; accompanied |
| B．Warning; accompanying |
| C．Having warned; accompanied |
| D．Having been warned; accompanying |
I don't doubt _____ he will pass the exam.
| A．whether | B．that | C．when | D．how |