It is (driving) (on the left) (what) causes visitors to Britain the (most) trouble.

admin2008-04-13  28

问题 It is (driving) (on the left) (what) causes visitors to Britain the (most) trouble.

选项 A、driving
B、on the left
C、what
D、most

答案C

解析 强调句it is... that...。所以C项改为that就对了。
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