Question

It is so wet there _____ the trees are extremely tall, some measuring over 90 meters.

1. A.
   what
2. B.
   which
3. C.
   that
4. D.
   why

Answer 1

C
考查强调句型。强调句型：It is/was 被强调成分that 其它成分。去掉it is/was that，句子仍然成立。