It suddenly occurred to him __________ he had left his keys in the office.
A.whether |
B.where |
C.which |
D.that |
Was it on a lonely islandhe was saved one month after the boat went down.
A.where |
B.that |
C.which |
D.what |
John's success has nothing to do with good luck. It is years of hard work _______has made him a great scientist today.
A.that |
B.when |
C.which |
D.why |
It was 80 years before Christopher Columbus crossed the Atlantic______ Zheng sailed to East Africa
A.when |
B.that |
C.after |
D.since |
It was not until near the end of the letter ______ she mentioned her own plan.
A.where |
B.that |
C.why |
D.when |
It was only after he had read the papersMr. Gross realized the task before him was extremely difficult to complete.
A.when |
B.that |
C.which |
D.What |