23. _ there is another planet for creatures to live on _ a question.
(A) If… remaining
(B) Whether… remaining
(C) If… remains
(D) Whether… remains

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統計： A(58), B(120), C(61), D(179), E(0) #1299119

B1 · 2016/06/29

#1399423

if 作為"是否"的意思時, 不能作為主要子句的主詞,

故 A), C) 刪除

"Whether there is another planet for creatures to live on" 一整段名詞子句作為主詞, 後面接動詞 remains

23. _______ there is another planet for creatures to live on _______ a question. (A) If… remaining (B) Whether… remaining (C) If… remains (D) Whether… remains