问题：
It was March 11, 2011 ____ magnitude-9.0 earthquake struck Japan and subsequent tsunami
triggered the large-scale crisis.
[ ]
A. that
B. when
C. in which
D. which
It was March 11, 2011 ____ magnitude-9.0 earthquake struck Japan and subsequent tsunami
triggered the large-scale crisis.
B. when
C. in which
D. which
triggered the large-scale crisis.
[ ]
A. that B. when
C. in which
D. which
参考答案：