问题
What happened here yesterday?—–An adventurer was walking at the foot of the mountain ______ suddenly a stone fell and hit him on the head
A:where
B:while
C:how
D:when
B:while
C:how
D:when
正确答案是：
同类题型
are you still here! Everybody has gone to attend the lecture by the president!— Oh, I ____ about it!
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Only when the war was over ____ to his home town.
Where have you been, Ann You on the phone just now.
the crowded bus __________, who wasdressed in a black suit and waving to a woman