So difficult ________ that ________ three months to prepare. A. is the test / do the students need B. the test is / do the students need C. is the test / the students need D. the test is
So difficult ________ that ________ three months to prepare.
A. is the test / do the students need
B. the test is / do the students need
C. is the test / the students need
D. the test is / the students need