Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it comes to standard tests.

A. is, when         B. are, when            C. is, while            D. are, as

Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it comes to standard tests.

A. are; when            B. is; when         C. is; while            D. are; as

Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it comes to standard tests.

1. A.
   is, when
2. B.
   are, when
3. C.
   is, while
4. D.
   are, as

Listening attentively in class and reviewing in time _________ a sure way to improve, your learning, and this is especially tree _________ it comes to standard tests.

A．is; when        B．are; when        C．is; while             D．are; as

 Listening attentively in class and reviewing in time _____ a sure way to improve your learning, and this is especially true _____ it comes to standard tests.

  A   is , when    B   are,  when   C   is,  while    D   are,   as

Listening attentively in class and reviewing in time _____ a sure way to improve your learning, and this is especially true _____ it comes to standard tests.

A. is, when　　　　 B. are, when　　　　　　 C. is, while　　　　　　 D. are, as

Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it comes to standard tests.