Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.

Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.

A. is, in that     B. are, in that    C. is, in which  D. are, at that

Criticism and self-criticism is necessary　　　 it helps us to correct our mistakes.

A. so　　　　　　　 B. however　　　　 C. therefore　　　　 D. in that

Criticism and self-criticism _____ necessary _____ it helps us to correct mistakes.

    A. is, in that     B. are, in that    C. is, in which  D. are, at that

Criticism and self-criticism is necessary _____ it helps us to correct our mistakes.

A. by that       B. at that C. on that       D. in that