They had planned to go for a picnic, but because of the rain they had to stay home .
A. instead
B. really
C. however
D. though
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(答案→)A. instead
B. really
C. however
D. though
解析：词义辨析。 A.代替；反而 B.实际上；事实上 C. 无论如何 D. 虽然；尽管。句意：他们计划去野餐，但是因为这场雨他们反而不得不呆在家。故选A。