问题

_____ worries the doctor most was _______they could find the cause of the disease
A:However
B:Whatever
C:Which
D:While
B:Whatever
C:Which
D:While
正确答案是:
同类题型
______________should be paid to our study,and only in this way ________make progress.
________ struck me most in the movie was the father’s deep love for his son.
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o ladiesare _______ the same age, but there seems to be ten years _______ them